320542536501261 has 32 divisors (see below), whose sum is σ = 483060503270400. Its totient is φ = 210014830617840.

The previous prime is 320542536501181. The next prime is 320542536501269. The reversal of 320542536501261 is 162105635245023.

320542536501261 is a `hidden beast` number, since 3 + 2 + 0 + 5 + 4 + 2 + 536 + 50 + 1 + 2 + 61 = 666.

It is not a de Polignac number, because 320542536501261 - 2⁷ = 320542536501133 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (320542536501269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 22146955 + ... + 33638856.

It is an arithmetic number, because the mean of its divisors is an integer number (15095640727200).

Almost surely, 2^{320542536501261} is an apocalyptic number.

It is an amenable number.

320542536501261 is a deficient number, since it is larger than the sum of its proper divisors (162517966769139).

320542536501261 is a wasteful number, since it uses less digits than its factorization.

320542536501261 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 55789486 (or 55789480 counting only the distinct ones).

The product of its (nonzero) digits is 1296000, while the sum is 45.

The spelling of 320542536501261 in words is "three hundred twenty trillion, five hundred forty-two billion, five hundred thirty-six million, five hundred one thousand, two hundred sixty-one".