13668213904 has 20 divisors (see below), whose sum is σ = 26499264876. Its totient is φ = 6829693952.

The previous prime is 13668213869. The next prime is 13668213913. The reversal of 13668213904 is 40931286631.

It can be written as a sum of positive squares in 2 ways, for example, as 3916256400 + 9751957504 = 62580^2 + 98752^2 .

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, 250189 + ... + 299884.

Almost surely, 2^13668213904 is an apocalyptic number.

It is an amenable number.

13668213904 is a deficient number, since it is larger than the sum of its proper divisors (12831050972).

13668213904 is a wasteful number, since it uses less digits than its factorization.

13668213904 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 551634 (or 551628 counting only the distinct ones).

The product of its (nonzero) digits is 186624, while the sum is 43.

The spelling of 13668213904 in words is "thirteen billion, six hundred sixty-eight million, two hundred thirteen thousand, nine hundred four".