13121656564326 has 32 divisors (see below), whose sum is σ = 27003207372768. Its totient is φ = 4248870662400.

The previous prime is 13121656564231. The next prime is 13121656564339. The reversal of 13121656564326 is 62346565612131.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 204240511 + ... + 204304746.

It is an arithmetic number, because the mean of its divisors is an integer number (843850230399).

Almost surely, 2^{13121656564326} is an apocalyptic number.

13121656564326 is an abundant number, since it is smaller than the sum of its proper divisors (13881550808442).

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

13121656564326 is a wasteful number, since it uses less digits than its factorization.

13121656564326 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 408545416.

The product of its digits is 4665600, while the sum is 51.

The spelling of 13121656564326 in words is "thirteen trillion, one hundred twenty-one billion, six hundred fifty-six million, five hundred sixty-four thousand, three hundred twenty-six".