31440561495868 has 54 divisors (see below), whose sum is σ = 63372630172488. Its totient is φ = 13370014307520.

The previous prime is 31440561495857. The next prime is 31440561495881. The reversal of 31440561495868 is 86859416504413.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 3886825168 + ... + 3886833256.

Almost surely, 2^{31440561495868} is an apocalyptic number.

It is an amenable number.

31440561495868 is an abundant number, since it is smaller than the sum of its proper divisors (31932068676620).

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

31440561495868 is an frugal number, since it uses more digits than its factorization.

31440561495868 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16451 (or 8229 counting only the distinct ones).

The product of its (nonzero) digits is 99532800, while the sum is 64.

The spelling of 31440561495868 in words is "thirty-one trillion, four hundred forty billion, five hundred sixty-one million, four hundred ninety-five thousand, eight hundred sixty-eight".