252651277638 has 48 divisors (see below), whose sum is σ = 574044793920. Its totient is φ = 80199165312.

The previous prime is 252651277631. The next prime is 252651277759. The reversal of 252651277638 is 836772156252.

252651277638 is a `hidden beast` number, since 2 + 5 + 26 + 512 + 7 + 76 + 38 = 666.

It is a super-2 number, since 2×252651277638² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (252651277631) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3277006 + ... + 3353217.

It is an arithmetic number, because the mean of its divisors is an integer number (11959266540).

Almost surely, 2^252651277638 is an apocalyptic number.

252651277638 is an abundant number, since it is smaller than the sum of its proper divisors (321393516282).

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

252651277638 is a wasteful number, since it uses less digits than its factorization.

252651277638 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6630333 (or 6630330 counting only the distinct ones).

The product of its digits is 8467200, while the sum is 54.

The spelling of 252651277638 in words is "two hundred fifty-two billion, six hundred fifty-one million, two hundred seventy-seven thousand, six hundred thirty-eight".