13640566536 has 80 divisors (see below), whose sum is σ = 38351966400. Its totient is φ = 4529510496.

The previous prime is 13640566481. The next prime is 13640566543. The reversal of 13640566536 is 63566504631.

13640566536 is a `hidden beast` number, since 1 + 3 + 64 + 0 + 56 + 6 + 536 = 666.

It is a junction number, because it is equal to n+sod(n) for n = 13640566491 and 13640566500.

It is an unprimeable number.

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 19 ways as a sum of consecutive naturals, for example, 130405 + ... + 210443.

It is an arithmetic number, because the mean of its divisors is an integer number (479399580).

Almost surely, 2^13640566536 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 13640566536, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (19175983200).

13640566536 is an abundant number, since it is smaller than the sum of its proper divisors (24711399864).

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

13640566536 is a wasteful number, since it uses less digits than its factorization.

13640566536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 80320 (or 80307 counting only the distinct ones).

The product of its (nonzero) digits is 1166400, while the sum is 45.

The spelling of 13640566536 in words is "thirteen billion, six hundred forty million, five hundred sixty-six thousand, five hundred thirty-six".