6561495323972 has 12 divisors (see below), whose sum is σ = 11482866204096. Its totient is φ = 3280676408520.

The previous prime is 6561495323959. The next prime is 6561495324031. The reversal of 6561495323972 is 2793235941656.

It is a happy number.

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, 17605904 + ... + 17974727.

It is an arithmetic number, because the mean of its divisors is an integer number (956905517008).

Almost surely, 2^{6561495323972} is an apocalyptic number.

It is an amenable number.

6561495323972 is a deficient number, since it is larger than the sum of its proper divisors (4921370880124).

6561495323972 is a wasteful number, since it uses less digits than its factorization.

6561495323972 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35626738 (or 35626736 counting only the distinct ones).

The product of its digits is 73483200, while the sum is 62.

The spelling of 6561495323972 in words is "six trillion, five hundred sixty-one billion, four hundred ninety-five million, three hundred twenty-three thousand, nine hundred seventy-two".