320056537402865 has 16 divisors (see below), whose sum is σ = 406663004137680. Its totient is φ = 240982007685120.

The previous prime is 320056537402817. The next prime is 320056537402867. The reversal of 320056537402865 is 568204735650023.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 667489 + 320056536735376 = 817^2 + 17890124^2 .

It is not a de Polignac number, because 320056537402865 - 2¹² = 320056537398769 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320056537402865.

It is not an unprimeable number, because it can be changed into a prime (320056537402867) 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, 1663730 + ... + 25355099.

It is an arithmetic number, because the mean of its divisors is an integer number (25416437758605).

Almost surely, 2^{320056537402865} is an apocalyptic number.

It is an amenable number.

320056537402865 is a deficient number, since it is larger than the sum of its proper divisors (86606466734815).

320056537402865 is a wasteful number, since it uses less digits than its factorization.

320056537402865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 27158212.

The product of its (nonzero) digits is 36288000, while the sum is 56.

The spelling of 320056537402865 in words is "three hundred twenty trillion, fifty-six billion, five hundred thirty-seven million, four hundred two thousand, eight hundred sixty-five".