331508664721 has 16 divisors (see below), whose sum is σ = 375827538240. Its totient is φ = 289880527680.

The previous prime is 331508664703. The next prime is 331508664793. The reversal of 331508664721 is 127466805133.

It is a cyclic number.

It is not a de Polignac number, because 331508664721 - 2²³ = 331500276113 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (331508664521) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3853386 + ... + 3938476.

It is an arithmetic number, because the mean of its divisors is an integer number (23489221140).

Almost surely, 2^331508664721 is an apocalyptic number.

It is an amenable number.

331508664721 is a deficient number, since it is larger than the sum of its proper divisors (44318873519).

331508664721 is a wasteful number, since it uses less digits than its factorization.

331508664721 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 100896.

The product of its (nonzero) digits is 725760, while the sum is 46.

The spelling of 331508664721 in words is "three hundred thirty-one billion, five hundred eight million, six hundred sixty-four thousand, seven hundred twenty-one".