631620026136 has 144 divisors (see below), whose sum is σ = 1884225470400. Its totient is φ = 190999163520.

The previous prime is 631620026041. The next prime is 631620026189.

631620026136 is a `hidden beast` number, since 6 + 3 + 1 + 620 + 0 + 26 + 1 + 3 + 6 = 666.

631620026136 is nontrivially palindromic in base 10.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a self number, because there is not a number n which added to its sum of digits gives 631620026136.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 4097370 + ... + 4248726.

It is an arithmetic number, because the mean of its divisors is an integer number (13084899100).

Almost surely, 2^631620026136 is an apocalyptic number.

631620026136 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631620026136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (942112735200).

631620026136 is an abundant number, since it is smaller than the sum of its proper divisors (1252605444264).

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

631620026136 is a wasteful number, since it uses less digits than its factorization.

631620026136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 151870 (or 151852 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The spelling of 631620026136 in words is "six hundred thirty-one billion, six hundred twenty million, twenty-six thousand, one hundred thirty-six".