631637957997 has 12 divisors (see below), whose sum is σ = 912629597724. Its totient is φ = 420970283520.

The previous prime is 631637957987. The next prime is 631637958041. The reversal of 631637957997 is 799759736136.

631637957997 is a `hidden beast` number, since 6 + 3 + 16 + 37 + 9 + 579 + 9 + 7 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 49795476201 + 581842481796 = 223149^2 + 762786^2 .

It is not a de Polignac number, because 631637957997 - 2⁴ = 631637957981 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631637957917) 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 11 ways as a sum of consecutive naturals, for example, 10107828 + ... + 10170125.

It is an arithmetic number, because the mean of its divisors is an integer number (76052466477).

Almost surely, 2^631637957997 is an apocalyptic number.

It is an amenable number.

631637957997 is a deficient number, since it is larger than the sum of its proper divisors (280991639727).

631637957997 is a wasteful number, since it uses less digits than its factorization.

631637957997 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 20281420 (or 20281417 counting only the distinct ones).

The product of its digits is 405076140, while the sum is 72.

The spelling of 631637957997 in words is "six hundred thirty-one billion, six hundred thirty-seven million, nine hundred fifty-seven thousand, nine hundred ninety-seven".