318856531172 has 6 divisors (see below), whose sum is σ = 557998929558. Its totient is φ = 159428265584.

The previous prime is 318856531159. The next prime is 318856531177. The reversal of 318856531172 is 271135658813.

It can be written as a sum of positive squares in only one way, i.e., 236501306596 + 82355224576 = 486314^2 + 286976^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 318856531172.

It is not an unprimeable number, because it can be changed into a prime (318856531177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39857066393 + ... + 39857066400.

It is an arithmetic number, because the mean of its divisors is an integer number (92999821593).

Almost surely, 2^318856531172 is an apocalyptic number.

It is an amenable number.

318856531172 is a deficient number, since it is larger than the sum of its proper divisors (239142398386).

318856531172 is a wasteful number, since it uses less digits than its factorization.

318856531172 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 79714132797 (or 79714132795 counting only the distinct ones).

The product of its digits is 1209600, while the sum is 50.

The spelling of 318856531172 in words is "three hundred eighteen billion, eight hundred fifty-six million, five hundred thirty-one thousand, one hundred seventy-two".