320631345361521 has 24 divisors (see below), whose sum is σ = 463253102940264. Its totient is φ = 213699340177920.

The previous prime is 320631345361487. The next prime is 320631345361631. The reversal of 320631345361521 is 125163543136023.

320631345361521 is a `hidden beast` number, since 3 + 2 + 0 + 6 + 3 + 1 + 3 + 4 + 5 + 3 + 615 + 21 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 47049159659121 + 273582185702400 = 6859239^2 + 16540320^2 .

It is not a de Polignac number, because 320631345361521 - 2¹³ = 320631345353329 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320631345361721) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1016051655 + ... + 1016367171.

It is an arithmetic number, because the mean of its divisors is an integer number (19302212622511).

Almost surely, 2^{320631345361521} is an apocalyptic number.

It is an amenable number.

320631345361521 is a deficient number, since it is larger than the sum of its proper divisors (142621757578743).

320631345361521 is a wasteful number, since it uses less digits than its factorization.

320631345361521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 344161 (or 344158 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 45.

Adding to 320631345361521 its reverse (125163543136023), we get a palindrome (445794888497544).

The spelling of 320631345361521 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-one".