13971366664 has 16 divisors (see below), whose sum is σ = 26198538300. Its totient is φ = 6985089792.

The previous prime is 13971366659. The next prime is 13971366667. The reversal of 13971366664 is 46666317931.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13808600100 + 162766564 = 117510^2 + 12758^2 .

It is not an unprimeable number, because it can be changed into a prime (13971366667) 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, 35364 + ... + 170860.

Almost surely, 2^13971366664 is an apocalyptic number.

It is an amenable number.

13971366664 is a deficient number, since it is larger than the sum of its proper divisors (12227171636).

13971366664 is a wasteful number, since it uses less digits than its factorization.

13971366664 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 148392 (or 148388 counting only the distinct ones).

The product of its digits is 2939328, while the sum is 52.

The spelling of 13971366664 in words is "thirteen billion, nine hundred seventy-one million, three hundred sixty-six thousand, six hundred sixty-four".