13665966928 has 20 divisors (see below), whose sum is σ = 26497895668. Its totient is φ = 6827800320.

The previous prime is 13665966911. The next prime is 13665966959. The reversal of 13665966928 is 82966956631.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 13177203264 + 488763664 = 114792^2 + 22108^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 302151 + ... + 344422.

Almost surely, 2^13665966928 is an apocalyptic number.

It is an amenable number.

13665966928 is a deficient number, since it is larger than the sum of its proper divisors (12831928740).

13665966928 is a wasteful number, since it uses less digits than its factorization.

13665966928 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647902 (or 647896 counting only the distinct ones).

The product of its digits is 25194240, while the sum is 61.

The spelling of 13665966928 in words is "thirteen billion, six hundred sixty-five million, nine hundred sixty-six thousand, nine hundred twenty-eight".