318821656408 has 32 divisors (see below), whose sum is σ = 605869306560. Its totient is φ = 157262073120.

The previous prime is 318821656399. The next prime is 318821656429. The reversal of 318821656408 is 804656128813.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111391 + ... + 806257.

It is an arithmetic number, because the mean of its divisors is an integer number (18933415830).

Almost surely, 2^318821656408 is an apocalyptic number.

It is an amenable number.

318821656408 is a deficient number, since it is larger than the sum of its proper divisors (287047650152).

318821656408 is a wasteful number, since it uses less digits than its factorization.

318821656408 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 695647 (or 695643 counting only the distinct ones).

The product of its (nonzero) digits is 2211840, while the sum is 52.

The spelling of 318821656408 in words is "three hundred eighteen billion, eight hundred twenty-one million, six hundred fifty-six thousand, four hundred eight".