809431968925 has 72 divisors (see below), whose sum is σ = 1099642639200. Its totient is φ = 589357814400.

The previous prime is 809431968901. The next prime is 809431968941. The reversal of 809431968925 is 529869134908.

It is not a de Polignac number, because 809431968925 - 2³¹ = 807284485277 is a prime.

It is a super-2 number, since 2×809431968925² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 63443647 + ... + 63456403.

Almost surely, 2^809431968925 is an apocalyptic number.

It is an amenable number.

809431968925 is a deficient number, since it is larger than the sum of its proper divisors (290210670275).

809431968925 is a wasteful number, since it uses less digits than its factorization.

809431968925 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 12987 (or 12951 counting only the distinct ones).

The product of its (nonzero) digits is 33592320, while the sum is 64.

The spelling of 809431968925 in words is "eight hundred nine billion, four hundred thirty-one million, nine hundred sixty-eight thousand, nine hundred twenty-five".