691659650404 has 12 divisors (see below), whose sum is σ = 1212418376428. Its totient is φ = 345254400000.

The previous prime is 691659650377. The next prime is 691659650453. The reversal of 691659650404 is 404056956196.

It can be written as a sum of positive squares in 2 ways, for example, as 500032836900 + 191626813504 = 707130^2 + 437752^2 .

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, 143853597 + ... + 143858404.

Almost surely, 2^691659650404 is an apocalyptic number.

It is an amenable number.

691659650404 is a deficient number, since it is larger than the sum of its proper divisors (520758726024).

691659650404 is a wasteful number, since it uses less digits than its factorization.

691659650404 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 287712606 (or 287712604 counting only the distinct ones).

The product of its (nonzero) digits is 6998400, while the sum is 55.

The spelling of 691659650404 in words is "six hundred ninety-one billion, six hundred fifty-nine million, six hundred fifty thousand, four hundred four".