631956310812 has 144 divisors (see below), whose sum is σ = 1711025316000. Its totient is φ = 195971457024.

The previous prime is 631956310723. The next prime is 631956310849. The reversal of 631956310812 is 218013659136.

631956310812 is a `hidden beast` number, since 6 + 3 + 1 + 9 + 5 + 631 + 0 + 8 + 1 + 2 = 666.

It is a super-2 number, since 2×631956310812² (a number of 24 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 25782939 + ... + 25807437.

It is an arithmetic number, because the mean of its divisors is an integer number (11882120250).

Almost surely, 2^631956310812 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 631956310812, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (855512658000).

631956310812 is an abundant number, since it is smaller than the sum of its proper divisors (1079069005188).

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

631956310812 is a wasteful number, since it uses less digits than its factorization.

631956310812 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25012 (or 25007 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

Adding to 631956310812 its reverse (218013659136), we get a palindrome (849969969948).

The spelling of 631956310812 in words is "six hundred thirty-one billion, nine hundred fifty-six million, three hundred ten thousand, eight hundred twelve".