631641260440 has 64 divisors (see below), whose sum is σ = 1425534969600. Its totient is φ = 251885334528.

The previous prime is 631641260381. The next prime is 631641260449. The reversal of 631641260440 is 44062146136.

It is a self number, because there is not a number n which added to its sum of digits gives 631641260440.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631641260449) 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 15 ways as a sum of consecutive naturals, for example, 29060857 + ... + 29082583.

It is an arithmetic number, because the mean of its divisors is an integer number (22273983900).

Almost surely, 2^631641260440 is an apocalyptic number.

It is an amenable number.

631641260440 is an abundant number, since it is smaller than the sum of its proper divisors (793893709160).

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

631641260440 is a wasteful number, since it uses less digits than its factorization.

631641260440 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 23924 (or 23920 counting only the distinct ones).

The product of its (nonzero) digits is 82944, while the sum is 37.

The spelling of 631641260440 in words is "six hundred thirty-one billion, six hundred forty-one million, two hundred sixty thousand, four hundred forty".