631645413020 has 24 divisors (see below), whose sum is σ = 1336137529104. Its totient is φ = 250813943936.

The previous prime is 631645413011. The next prime is 631645413023. The reversal of 631645413020 is 20314546136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631645413023) 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, 115261022 + ... + 115266501.

It is an arithmetic number, because the mean of its divisors is an integer number (55672397046).

Almost surely, 2^631645413020 is an apocalyptic number.

It is an amenable number.

631645413020 is an abundant number, since it is smaller than the sum of its proper divisors (704492116084).

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

631645413020 is a wasteful number, since it uses less digits than its factorization.

631645413020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230527669 (or 230527667 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 35.

Adding to 631645413020 its reverse (20314546136), we get a palindrome (651959959156).

The spelling of 631645413020 in words is "six hundred thirty-one billion, six hundred forty-five million, four hundred thirteen thousand, twenty".