252661866567 has 32 divisors (see below), whose sum is σ = 371388326400. Its totient is φ = 151512453120.

The previous prime is 252661866559. The next prime is 252661866607. The reversal of 252661866567 is 765668166252.

It is not a de Polignac number, because 252661866567 - 2³ = 252661866559 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 252661866567.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252661866517) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 18504559 + ... + 18518207.

It is an arithmetic number, because the mean of its divisors is an integer number (11605885200).

Almost surely, 2^252661866567 is an apocalyptic number.

252661866567 is a deficient number, since it is larger than the sum of its proper divisors (118726459833).

252661866567 is a wasteful number, since it uses less digits than its factorization.

252661866567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19543.

The product of its digits is 43545600, while the sum is 60.

The spelling of 252661866567 in words is "two hundred fifty-two billion, six hundred sixty-one million, eight hundred sixty-six thousand, five hundred sixty-seven".