636044621656056 has 32 divisors (see below), whose sum is σ = 1590113150720640. Its totient is φ = 212014661007968.

The previous prime is 636044621656051. The next prime is 636044621656061. The reversal of 636044621656056 is 650656126440636.

It is an interprime number because it is at equal distance from previous prime (636044621656051) and next prime (636044621656061).

It is a super-2 number, since 2×636044621656056² (a number of 30 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (636044621656051) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12084685 + ... + 37658051.

It is an arithmetic number, because the mean of its divisors is an integer number (49691035960020).

Almost surely, 2^{636044621656056} is an apocalyptic number.

It is an amenable number.

636044621656056 is an abundant number, since it is smaller than the sum of its proper divisors (954068529064584).

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

636044621656056 is a wasteful number, since it uses less digits than its factorization.

636044621656056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26609683 (or 26609679 counting only the distinct ones).

The product of its (nonzero) digits is 111974400, while the sum is 60.

The spelling of 636044621656056 in words is "six hundred thirty-six trillion, forty-four billion, six hundred twenty-one million, six hundred fifty-six thousand, fifty-six".