864806577939 has 20 divisors (see below), whose sum is σ = 1359864796840. Its totient is φ = 546193627200.

The previous prime is 864806577889. The next prime is 864806577983. The reversal of 864806577939 is 939775608468.

864806577939 is a `hidden beast` number, since 8 + 6 + 48 + 0 + 6 + 577 + 9 + 3 + 9 = 666.

It is not a de Polignac number, because 864806577939 - 2⁸ = 864806577683 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (864806579939) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 280962262 + ... + 280965339.

It is an arithmetic number, because the mean of its divisors is an integer number (67993239842).

Almost surely, 2^864806577939 is an apocalyptic number.

864806577939 is a deficient number, since it is larger than the sum of its proper divisors (495058218901).

864806577939 is a wasteful number, since it uses less digits than its factorization.

864806577939 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 561927632 (or 561927623 counting only the distinct ones).

The product of its (nonzero) digits is 548674560, while the sum is 72.

The spelling of 864806577939 in words is "eight hundred sixty-four billion, eight hundred six million, five hundred seventy-seven thousand, nine hundred thirty-nine".