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18190653689 = 131399281053
BaseRepresentation
bin10000111100001111…
…110101100011111001
31201221201220221201102
4100330033311203321
5244223301404224
612205012501145
71212532001525
oct207417654371
951851827642
1018190653689
11779517139a
12363801a7b5
13193b894710
14c47c98d85
15716eb84ae
hex43c3f58f9

18190653689 has 4 divisors (see below), whose sum is σ = 19589934756. Its totient is φ = 16791372624.

The previous prime is 18190653671. The next prime is 18190653697. The reversal of 18190653689 is 98635609181.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 98635609181 = 234288504747.

It can be written as a sum of positive squares in 2 ways, for example, as 12037820089 + 6152833600 = 109717^2 + 78440^2 .

It is not a de Polignac number, because 18190653689 - 216 = 18190588153 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18190653289) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 699640514 + ... + 699640539.

It is an arithmetic number, because the mean of its divisors is an integer number (4897483689).

Almost surely, 218190653689 is an apocalyptic number.

It is an amenable number.

18190653689 is a deficient number, since it is larger than the sum of its proper divisors (1399281067).

18190653689 is a wasteful number, since it uses less digits than its factorization.

18190653689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1399281066.

The product of its (nonzero) digits is 2799360, while the sum is 56.

The spelling of 18190653689 in words is "eighteen billion, one hundred ninety million, six hundred fifty-three thousand, six hundred eighty-nine".

Divisors: 1 13 1399281053 18190653689