631720520968 has 32 divisors (see below), whose sum is σ = 1252309471200. Its totient is φ = 297917799552.

The previous prime is 631720520933. The next prime is 631720520969. The reversal of 631720520968 is 869025027136.

It is a super-2 number, since 2×631720520968² (a number of 24 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (631720520969) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9119805 + ... + 9188812.

It is an arithmetic number, because the mean of its divisors is an integer number (39134670975).

Almost surely, 2^631720520968 is an apocalyptic number.

It is an amenable number.

631720520968 is a deficient number, since it is larger than the sum of its proper divisors (620588950232).

631720520968 is a wasteful number, since it uses less digits than its factorization.

631720520968 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18308869 (or 18308865 counting only the distinct ones).

The product of its (nonzero) digits is 1088640, while the sum is 49.

The spelling of 631720520968 in words is "six hundred thirty-one billion, seven hundred twenty million, five hundred twenty thousand, nine hundred sixty-eight".