691578808916 has 48 divisors (see below), whose sum is σ = 1275630225408. Its totient is φ = 327610483200.

The previous prime is 691578808909. The next prime is 691578808937. The reversal of 691578808916 is 619808875196.

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, 2929196 + ... + 3156476.

It is an arithmetic number, because the mean of its divisors is an integer number (26575629696).

Almost surely, 2^691578808916 is an apocalyptic number.

It is an amenable number.

691578808916 is a deficient number, since it is larger than the sum of its proper divisors (584051416492).

691578808916 is a wasteful number, since it uses less digits than its factorization.

691578808916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 227832 (or 227830 counting only the distinct ones).

The product of its (nonzero) digits is 52254720, while the sum is 68.

The spelling of 691578808916 in words is "six hundred ninety-one billion, five hundred seventy-eight million, eight hundred eight thousand, nine hundred sixteen".