320635056463561 has 48 divisors (see below), whose sum is σ = 383361978674304. Its totient is φ = 267194479700736.

The previous prime is 320635056463543. The next prime is 320635056463597. The reversal of 320635056463561 is 165364650536023.

It is not a de Polignac number, because 320635056463561 - 2²¹ = 320635054366409 is a prime.

It is not an unprimeable number, because it can be changed into a prime (320635056463061) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 14350570956 + ... + 14350593298.

It is an arithmetic number, because the mean of its divisors is an integer number (7986707889048).

Almost surely, 2^{320635056463561} is an apocalyptic number.

It is an amenable number.

320635056463561 is a deficient number, since it is larger than the sum of its proper divisors (62726922210743).

320635056463561 is a wasteful number, since it uses less digits than its factorization.

320635056463561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 28190 (or 28183 counting only the distinct ones).

The product of its (nonzero) digits is 34992000, while the sum is 55.

The spelling of 320635056463561 in words is "three hundred twenty trillion, six hundred thirty-five billion, fifty-six million, four hundred sixty-three thousand, five hundred sixty-one".