18986635265 has 32 divisors (see below), whose sum is σ = 25243729056. Its totient is φ = 13619773440.

The previous prime is 18986635177. The next prime is 18986635271. The reversal of 18986635265 is 56253668981.

It is a Cunningham number, because it is equal to 137792²+1.

It can be written as a sum of positive squares in 16 ways, for example, as 16178059249 + 2808576016 = 127193^2 + 52996^2 .

It is not a de Polignac number, because 18986635265 - 2¹⁴ = 18986618881 is a prime.

It is a super-2 number, since 2×18986635265² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 605657 + ... + 636233.

It is an arithmetic number, because the mean of its divisors is an integer number (788866533).

Almost surely, 2^18986635265 is an apocalyptic number.

It is an amenable number.

18986635265 is a deficient number, since it is larger than the sum of its proper divisors (6257093791).

18986635265 is a wasteful number, since it uses less digits than its factorization.

18986635265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 30869.

The product of its digits is 18662400, while the sum is 59.

The spelling of 18986635265 in words is "eighteen billion, nine hundred eighty-six million, six hundred thirty-five thousand, two hundred sixty-five".