Search a number
-
+
18351666681 = 3139317138829
BaseRepresentation
bin10001000101110110…
…000011010111111001
31202100221220021000120
4101011312003113321
5300041011313211
612233003523453
71216525410255
oct210566032771
952327807016
1018351666681
117868045887
123681b29589
13196604b28a
14c6140d265
157261c0d06
hex445d835f9

18351666681 has 16 divisors (see below), whose sum is σ = 24722846400. Its totient is φ = 12108022848.

The previous prime is 18351666679. The next prime is 18351666689. The reversal of 18351666681 is 18666615381.

It is not a de Polignac number, because 18351666681 - 21 = 18351666679 is a prime.

It is a super-2 number, since 2×183516666812 (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (18351666689) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 62775 + ... + 201603.

It is an arithmetic number, because the mean of its divisors is an integer number (1545177900).

Almost surely, 218351666681 is an apocalyptic number.

It is an amenable number.

18351666681 is a deficient number, since it is larger than the sum of its proper divisors (6371179719).

18351666681 is a wasteful number, since it uses less digits than its factorization.

18351666681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 139288.

The product of its digits is 1244160, while the sum is 51.

The spelling of 18351666681 in words is "eighteen billion, three hundred fifty-one million, six hundred sixty-six thousand, six hundred eighty-one".

Divisors: 1 3 139 317 417 951 44063 132189 138829 416487 19297231 44008793 57891693 132026379 6117222227 18351666681