252320642561 has 16 divisors (see below), whose sum is σ = 286534348800. Its totient is φ = 220264956288.

The previous prime is 252320642531. The next prime is 252320642569. The reversal of 252320642561 is 165246023252.

It is a de Polignac number, because none of the positive numbers 2^k-252320642561 is a prime.

It is not an unprimeable number, because it can be changed into a prime (252320642569) 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, 757121 + ... + 1038206.

It is an arithmetic number, because the mean of its divisors is an integer number (17908396800).

Almost surely, 2^252320642561 is an apocalyptic number.

It is an amenable number.

252320642561 is a deficient number, since it is larger than the sum of its proper divisors (34213706239).

252320642561 is a wasteful number, since it uses less digits than its factorization.

252320642561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1795928.

The product of its (nonzero) digits is 172800, while the sum is 38.

The spelling of 252320642561 in words is "two hundred fifty-two billion, three hundred twenty million, six hundred forty-two thousand, five hundred sixty-one".