320631345361520 has 40 divisors (see below), whose sum is σ = 745468705595040. Its totient is φ = 128252395756800.

The previous prime is 320631345361487. The next prime is 320631345361631. The reversal of 320631345361520 is 25163543136023.

It is a tau number, because it is divible by the number of its divisors (40).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 98746421 + ... + 101941739.

It is an arithmetic number, because the mean of its divisors is an integer number (18636717639876).

Almost surely, 2^{320631345361520} is an apocalyptic number.

It is an amenable number.

320631345361520 is an abundant number, since it is smaller than the sum of its proper divisors (424837360233520).

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

320631345361520 is a wasteful number, since it uses less digits than its factorization.

320631345361520 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4449633 (or 4449627 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 44.

Adding to 320631345361520 its reverse (25163543136023), we get a palindrome (345794888497543).

The spelling of 320631345361520 in words is "three hundred twenty trillion, six hundred thirty-one billion, three hundred forty-five million, three hundred sixty-one thousand, five hundred twenty".