31636636512 has 48 divisors (see below), whose sum is σ = 89434341360. Its totient is φ = 9734349312.

The previous prime is 31636636397. The next prime is 31636636517. The reversal of 31636636512 is 21563663613.

It is a tau number, because it is divible by the number of its divisors (48).

It is a super-2 number, since 2×31636636512² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (31636636517) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 12673687 + ... + 12676182.

It is an arithmetic number, because the mean of its divisors is an integer number (1863215445).

Almost surely, 2^31636636512 is an apocalyptic number.

31636636512 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

31636636512 is an abundant number, since it is smaller than the sum of its proper divisors (57797704848).

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

31636636512 is a wasteful number, since it uses less digits than its factorization.

31636636512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25349895 (or 25349887 counting only the distinct ones).

The product of its digits is 349920, while the sum is 42.

The spelling of 31636636512 in words is "thirty-one billion, six hundred thirty-six million, six hundred thirty-six thousand, five hundred twelve".