631940342580 has 72 divisors (see below), whose sum is σ = 1917377221032. Its totient is φ = 168474214656.

The previous prime is 631940342573. The next prime is 631940342581. The reversal of 631940342580 is 85243049136.

631940342580 is a `hidden beast` number, since 6 + 31 + 9 + 4 + 0 + 34 + 2 + 580 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 26102279844 + 605838062736 = 161562^2 + 778356^2 .

It is a super-2 number, since 2×631940342580² (a number of 24 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (631940342581) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 256914 + ... + 1153206.

It is an arithmetic number, because the mean of its divisors is an integer number (26630239181).

Almost surely, 2^631940342580 is an apocalyptic number.

631940342580 is a gapful number since it is divisible by the number (60) formed by its first and last digit.

It is an amenable number.

631940342580 is an abundant number, since it is smaller than the sum of its proper divisors (1285436878452).

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

631940342580 is a wasteful number, since it uses less digits than its factorization.

631940342580 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 900225 (or 900220 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 631940342580 in words is "six hundred thirty-one billion, nine hundred forty million, three hundred forty-two thousand, five hundred eighty".