13640021616 has 40 divisors (see below), whose sum is σ = 37947241360. Its totient is φ = 4196929536.

The previous prime is 13640021611. The next prime is 13640021623. The reversal of 13640021616 is 61612004631.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13640021611) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10928881 + ... + 10930128.

It is an arithmetic number, because the mean of its divisors is an integer number (948681034).

Almost surely, 2^13640021616 is an apocalyptic number.

13640021616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13640021616 is an abundant number, since it is smaller than the sum of its proper divisors (24307219744).

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

13640021616 is a wasteful number, since it uses less digits than its factorization.

13640021616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21859033 (or 21859027 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 30.

The spelling of 13640021616 in words is "thirteen billion, six hundred forty million, twenty-one thousand, six hundred sixteen".