313521665636 has 6 divisors (see below), whose sum is σ = 548662914870. Its totient is φ = 156760832816.

The previous prime is 313521665591. The next prime is 313521665659. The reversal of 313521665636 is 636566125313.

It can be written as a sum of positive squares in only one way, i.e., 263856868900 + 49664796736 = 513670^2 + 222856^2 .

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39190208201 + ... + 39190208208.

It is an arithmetic number, because the mean of its divisors is an integer number (91443819145).

Almost surely, 2^313521665636 is an apocalyptic number.

It is an amenable number.

313521665636 is a deficient number, since it is larger than the sum of its proper divisors (235141249234).

313521665636 is a wasteful number, since it uses less digits than its factorization.

313521665636 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 78380416413 (or 78380416411 counting only the distinct ones).

The product of its digits is 1749600, while the sum is 47.

The spelling of 313521665636 in words is "three hundred thirteen billion, five hundred twenty-one million, six hundred sixty-five thousand, six hundred thirty-six".