320725186857 has 12 divisors (see below), whose sum is σ = 464301501300. Its totient is φ = 213340581888.

The previous prime is 320725186787. The next prime is 320725186861. The reversal of 320725186857 is 758681527023.

320725186857 is a `hidden beast` number, since 3 + 2 + 0 + 72 + 518 + 6 + 8 + 57 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 268402741776 + 52322445081 = 518076^2 + 228741^2 .

It is not a de Polignac number, because 320725186857 - 2¹⁸ = 320724924713 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320725186877) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 39679848 + ... + 39687929.

It is an arithmetic number, because the mean of its divisors is an integer number (38691791775).

Almost surely, 2^320725186857 is an apocalyptic number.

It is an amenable number.

320725186857 is a deficient number, since it is larger than the sum of its proper divisors (143576314443).

320725186857 is a wasteful number, since it uses less digits than its factorization.

320725186857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 79368232 (or 79368229 counting only the distinct ones).

The product of its (nonzero) digits is 5644800, while the sum is 54.

The spelling of 320725186857 in words is "three hundred twenty billion, seven hundred twenty-five million, one hundred eighty-six thousand, eight hundred fifty-seven".