313668323721 has 21 divisors (see below), whose sum is σ = 470310022749. Its totient is φ = 209102134716.

The previous prime is 313668323711. The next prime is 313668323819. The reversal of 313668323721 is 127323866313.

The square root of 313668323721 is 560061.

It is a perfect power (a square), and thus also a powerful number.

313668323721 is a `hidden beast` number, since 31 + 366 + 8 + 3 + 237 + 21 = 666.

It is not a de Polignac number, because 313668323721 - 2²⁷ = 313534105993 is a prime.

It is not an unprimeable number, because it can be changed into a prime (313668323701) by changing a digit.

It is a polite number, since it can be written in 20 ways as a sum of consecutive naturals, for example, 15111276 + ... + 15132018.

It is an arithmetic number, because the mean of its divisors is an integer number (22395715369).

Almost surely, 2^313668323721 is an apocalyptic number.

313668323721 is the 560061-st square number.

313668323721 is the 280031-st centered octagonal number.

It is an amenable number.

313668323721 is a deficient number, since it is larger than the sum of its proper divisors (156641699028).

313668323721 is an frugal number, since it uses more digits than its factorization.

313668323721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 41504 (or 20746 counting only the distinct ones).

The product of its digits is 653184, while the sum is 45.

The spelling of 313668323721 in words is "three hundred thirteen billion, six hundred sixty-eight million, three hundred twenty-three thousand, seven hundred twenty-one".