691815074394 has 64 divisors (see below), whose sum is σ = 1454220472320. Its totient is φ = 218987271360.

The previous prime is 691815074329. The next prime is 691815074407. The reversal of 691815074394 is 493470518196.

It is a happy number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 26657877 + ... + 26683815.

It is an arithmetic number, because the mean of its divisors is an integer number (22722194880).

Almost surely, 2^691815074394 is an apocalyptic number.

691815074394 is an abundant number, since it is smaller than the sum of its proper divisors (762405397926).

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

691815074394 is a wasteful number, since it uses less digits than its factorization.

691815074394 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27355.

The product of its (nonzero) digits is 6531840, while the sum is 57.

The spelling of 691815074394 in words is "six hundred ninety-one billion, eight hundred fifteen million, seventy-four thousand, three hundred ninety-four".