13664421616 has 40 divisors (see below), whose sum is σ = 27261317664. Its totient is φ = 6630973440.

The previous prime is 13664421613. The next prime is 13664421623. The reversal of 13664421616 is 61612446631.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (13664421613) 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, 72645 + ... + 180571.

Almost surely, 2^13664421616 is an apocalyptic number.

13664421616 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

13664421616 is a deficient number, since it is larger than the sum of its proper divisors (13596896048).

13664421616 is a wasteful number, since it uses less digits than its factorization.

13664421616 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 108169 (or 108163 counting only the distinct ones).

The product of its digits is 124416, while the sum is 40.

The spelling of 13664421616 in words is "thirteen billion, six hundred sixty-four million, four hundred twenty-one thousand, six hundred sixteen".