13638855136 has 24 divisors (see below), whose sum is σ = 27219329424. Its totient is φ = 6726009600.

The previous prime is 13638855133. The next prime is 13638855143. The reversal of 13638855136 is 63155883631.

It is a self number, because there is not a number n which added to its sum of digits gives 13638855136.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13638855133) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2916940 + ... + 2921611.

It is an arithmetic number, because the mean of its divisors is an integer number (1134138726).

Almost surely, 2^13638855136 is an apocalyptic number.

13638855136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13638855136 is a deficient number, since it is larger than the sum of its proper divisors (13580474288).

13638855136 is an equidigital number, since it uses as much as digits as its factorization.

13638855136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5838634 (or 5838626 counting only the distinct ones).

The product of its digits is 1555200, while the sum is 49.

The spelling of 13638855136 in words is "thirteen billion, six hundred thirty-eight million, eight hundred fifty-five thousand, one hundred thirty-six".