13643620656 has 80 divisors (see below), whose sum is σ = 35584686720. Its totient is φ = 4504314880.

The previous prime is 13643620597. The next prime is 13643620663. The reversal of 13643620656 is 65602634631.

It is a happy number.

It is a super-2 number, since 2×13643620656² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3726955 + ... + 3730613.

It is an arithmetic number, because the mean of its divisors is an integer number (444808584).

Almost surely, 2^13643620656 is an apocalyptic number.

13643620656 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13643620656 is an abundant number, since it is smaller than the sum of its proper divisors (21941066064).

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

13643620656 is a wasteful number, since it uses less digits than its factorization.

13643620656 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4394 (or 4388 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 42.

The spelling of 13643620656 in words is "thirteen billion, six hundred forty-three million, six hundred twenty thousand, six hundred fifty-six".