12695565538 has 8 divisors (see below), whose sum is σ = 19700015580. Its totient is φ = 6128893680.

The previous prime is 12695565529. The next prime is 12695565577. The reversal of 12695565538 is 83556559621.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 12378120049 + 317445489 = 111257^2 + 17817^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a super-2 number, since 2×12695565538² (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 3 ways as a sum of consecutive naturals, for example, 109444473 + ... + 109444588.

Almost surely, 2^12695565538 is an apocalyptic number.

12695565538 is a deficient number, since it is larger than the sum of its proper divisors (7004450042).

12695565538 is a wasteful number, since it uses less digits than its factorization.

12695565538 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 218889092.

The product of its digits is 9720000, while the sum is 55.

The spelling of 12695565538 in words is "twelve billion, six hundred ninety-five million, five hundred sixty-five thousand, five hundred thirty-eight".