631645543632 has 20 divisors (see below), whose sum is σ = 1631750987840. Its totient is φ = 210548514528.

The previous prime is 631645543579. The next prime is 631645543637. The reversal of 631645543632 is 236345546136.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 13159282159 = 631645543632 / (6 + 3 + 1 + 6 + 4 + 5 + 5 + 4 + 3 + 6 + 3 + 2).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631645543637) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 6579641032 + ... + 6579641127.

It is an arithmetic number, because the mean of its divisors is an integer number (81587549392).

Almost surely, 2^631645543632 is an apocalyptic number.

It is an amenable number.

631645543632 is an abundant number, since it is smaller than the sum of its proper divisors (1000105444208).

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

631645543632 is a wasteful number, since it uses less digits than its factorization.

631645543632 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13159282170 (or 13159282164 counting only the distinct ones).

The product of its digits is 4665600, while the sum is 48.

The spelling of 631645543632 in words is "six hundred thirty-one billion, six hundred forty-five million, five hundred forty-three thousand, six hundred thirty-two".