19664048642 has 16 divisors (see below), whose sum is σ = 33824855232. Its totient is φ = 8398685040.

The previous prime is 19664048629. The next prime is 19664048653. The reversal of 19664048642 is 24684046691.

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, 2392784 + ... + 2400987.

It is an arithmetic number, because the mean of its divisors is an integer number (2114053452).

Almost surely, 2^19664048642 is an apocalyptic number.

19664048642 is a deficient number, since it is larger than the sum of its proper divisors (14160806590).

19664048642 is a wasteful number, since it uses less digits than its factorization.

19664048642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4794073.

The product of its (nonzero) digits is 1990656, while the sum is 50.

The spelling of 19664048642 in words is "nineteen billion, six hundred sixty-four million, forty-eight thousand, six hundred forty-two".