631641156140 has 24 divisors (see below), whose sum is σ = 1326714984000. Its totient is φ = 252605308928.

The previous prime is 631641156067. The next prime is 631641156143. The reversal of 631641156140 is 41651146136.

It is a junction number, because it is equal to n+sod(n) for n = 631641156094 and 631641156103.

It is not an unprimeable number, because it can be changed into a prime (631641156143) 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, 3095765 + ... + 3293484.

It is an arithmetic number, because the mean of its divisors is an integer number (55279791000).

Almost surely, 2^631641156140 is an apocalyptic number.

It is an amenable number.

631641156140 is an abundant number, since it is smaller than the sum of its proper divisors (695073827860).

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

631641156140 is a wasteful number, since it uses less digits than its factorization.

631641156140 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6394201 (or 6394199 counting only the distinct ones).

The product of its (nonzero) digits is 51840, while the sum is 38.

The spelling of 631641156140 in words is "six hundred thirty-one billion, six hundred forty-one million, one hundred fifty-six thousand, one hundred forty".