811797664 has 12 divisors (see below), whose sum is σ = 1598226714. Its totient is φ = 405898816.

The previous prime is 811797659. The next prime is 811797683. The reversal of 811797664 is 466797118.

It can be written as a sum of positive squares in only one way, i.e., 811794064 + 3600 = 28492^2 + 60^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 12684307 + ... + 12684370.

Almost surely, 2^811797664 is an apocalyptic number.

It is an amenable number.

811797664 is a deficient number, since it is larger than the sum of its proper divisors (786429050).

811797664 is a wasteful number, since it uses less digits than its factorization.

811797664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 25368687 (or 25368679 counting only the distinct ones).

The product of its digits is 508032, while the sum is 49.

The square root of 811797664 is about 28492.0631755582. The cubic root of 811797664 is about 932.8588422643.

The spelling of 811797664 in words is "eight hundred eleven million, seven hundred ninety-seven thousand, six hundred sixty-four".