13661665604 has 12 divisors (see below), whose sum is σ = 24210547200. Its totient is φ = 6744366408.

The previous prime is 13661665601. The next prime is 13661665643. The reversal of 13661665604 is 40656616631.

It is a super-2 number, since 2×13661665604² (a number of 21 digits) contains 22 as substring.

It is a hoax number, since the sum of its digits (44) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (13661665601) 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, 21616244 + ... + 21616875.

It is an arithmetic number, because the mean of its divisors is an integer number (2017545600).

Almost surely, 2^13661665604 is an apocalyptic number.

It is an amenable number.

13661665604 is a deficient number, since it is larger than the sum of its proper divisors (10548881596).

13661665604 is a wasteful number, since it uses less digits than its factorization.

13661665604 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 43233202 (or 43233200 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 44.

The spelling of 13661665604 in words is "thirteen billion, six hundred sixty-one million, six hundred sixty-five thousand, six hundred four".