320561247761457 has 16 divisors (see below), whose sum is σ = 436516067727360. Its totient is φ = 209157111789392.

The previous prime is 320561247761431. The next prime is 320561247761519. The reversal of 320561247761457 is 754167742165023.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 320561247761457 - 2⁶ = 320561247761393 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 320561247761457.

It is not an unprimeable number, because it can be changed into a prime (320561247768457) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9908157 + ... + 27189962.

It is an arithmetic number, because the mean of its divisors is an integer number (27282254232960).

Almost surely, 2^{320561247761457} is an apocalyptic number.

It is an amenable number.

320561247761457 is a deficient number, since it is larger than the sum of its proper divisors (115954819965903).

320561247761457 is a wasteful number, since it uses less digits than its factorization.

320561247761457 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 37159452.

The product of its (nonzero) digits is 59270400, while the sum is 60.

The spelling of 320561247761457 in words is "three hundred twenty trillion, five hundred sixty-one billion, two hundred forty-seven million, seven hundred sixty-one thousand, four hundred fifty-seven".