13937665664 has 64 divisors (see below), whose sum is σ = 30117948000. Its totient is φ = 6386383872.

The previous prime is 13937665657. The next prime is 13937665697. The reversal of 13937665664 is 46656673931.

It is a tau number, because it is divible by the number of its divisors (64).

It is a super-2 number, since 2×13937665664² (a number of 21 digits) contains 22 as substring.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 201167 + ... + 261425.

Almost surely, 2^13937665664 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 13937665664, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (15058974000).

13937665664 is an abundant number, since it is smaller than the sum of its proper divisors (16180282336).

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

13937665664 is a wasteful number, since it uses less digits than its factorization.

13937665664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60425 (or 60413 counting only the distinct ones).

The product of its digits is 14696640, while the sum is 56.

The spelling of 13937665664 in words is "thirteen billion, nine hundred thirty-seven million, six hundred sixty-five thousand, six hundred sixty-four".