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18361045520 = 245229513069
BaseRepresentation
bin10001000110011001…
…110101001000010000
31202101121112202100222
4101012121311020100
5300100411424040
612233540532212
71220001211646
oct210631651020
952347482328
1018361045520
117872371294
1236850b1068
131967c8319c
14c62771196
15726e24bb5
hex446675210

18361045520 has 20 divisors (see below), whose sum is σ = 42689431020. Its totient is φ = 7344418176.

The previous prime is 18361045487. The next prime is 18361045553. The reversal of 18361045520 is 2554016381.

It is an interprime number because it is at equal distance from previous prime (18361045487) and next prime (18361045553).

It can be written as a sum of positive squares in 2 ways, for example, as 14095388176 + 4265657344 = 118724^2 + 65312^2 .

It is a tau number, because it is divible by the number of its divisors (20).

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 114756455 + ... + 114756614.

It is an arithmetic number, because the mean of its divisors is an integer number (2134471551).

Almost surely, 218361045520 is an apocalyptic number.

18361045520 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18361045520 is an abundant number, since it is smaller than the sum of its proper divisors (24328385500).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18361045520 is a wasteful number, since it uses less digits than its factorization.

18361045520 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 229513082 (or 229513076 counting only the distinct ones).

The product of its (nonzero) digits is 28800, while the sum is 35.

The spelling of 18361045520 in words is "eighteen billion, three hundred sixty-one million, forty-five thousand, five hundred twenty".

Divisors: 1 2 4 5 8 10 16 20 40 80 229513069 459026138 918052276 1147565345 1836104552 2295130690 3672209104 4590261380 9180522760 18361045520