318317399478 has 144 divisors (see below), whose sum is σ = 775226743200. Its totient is φ = 97441242624.

The previous prime is 318317399461. The next prime is 318317399497. The reversal of 318317399478 is 874993713813.

318317399478 is a `hidden beast` number, since 3 + 1 + 8 + 3 + 1 + 73 + 99 + 478 = 666.

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, 33941926 + ... + 33951302.

It is an arithmetic number, because the mean of its divisors is an integer number (5383519050).

Almost surely, 2^318317399478 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 318317399478, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (387613371600).

318317399478 is an abundant number, since it is smaller than the sum of its proper divisors (456909343722).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

318317399478 is an equidigital number, since it uses as much as digits as its factorization.

318317399478 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9615 (or 9594 counting only the distinct ones).

The product of its digits is 27433728, while the sum is 63.

The spelling of 318317399478 in words is "three hundred eighteen billion, three hundred seventeen million, three hundred ninety-nine thousand, four hundred seventy-eight".