252805861644 has 48 divisors (see below), whose sum is σ = 674217600000. Its totient is φ = 72222892416.

The previous prime is 252805861643. The next prime is 252805861661. The reversal of 252805861644 is 446168508252.

It is a happy number.

252805861644 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not an unprimeable number, because it can be changed into a prime (252805861643) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 705232 + ... + 1001480.

It is an arithmetic number, because the mean of its divisors is an integer number (14046200000).

Almost surely, 2^252805861644 is an apocalyptic number.

It is an amenable number.

252805861644 is an abundant number, since it is smaller than the sum of its proper divisors (421411738356).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

252805861644 is a wasteful number, since it uses less digits than its factorization.

252805861644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 306422 (or 306420 counting only the distinct ones).

The product of its (nonzero) digits is 3686400, while the sum is 51.

The spelling of 252805861644 in words is "two hundred fifty-two billion, eight hundred five million, eight hundred sixty-one thousand, six hundred forty-four".