864806579939 has 2 divisors, whose sum is σ = 864806579940. Its totient is φ = 864806579938.

The previous prime is 864806579929. The next prime is 864806579957. The reversal of 864806579939 is 939975608468.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 864806579939 - 2²⁰ = 864805531363 is a prime.

It is not a weakly prime, because it can be changed into another prime (864806579929) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 432403289969 + 432403289970.

It is an arithmetic number, because the mean of its divisors is an integer number (432403289970).

Almost surely, 2^864806579939 is an apocalyptic number.

864806579939 is a deficient number, since it is larger than the sum of its proper divisors (1).

864806579939 is an equidigital number, since it uses as much as digits as its factorization.

864806579939 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 705438720, while the sum is 74.

The spelling of 864806579939 in words is "eight hundred sixty-four billion, eight hundred six million, five hundred seventy-nine thousand, nine hundred thirty-nine".