19664005937 has 4 divisors (see below), whose sum is σ = 19854918720. Its totient is φ = 19473093156.

The previous prime is 19664005931. The next prime is 19664005973. The reversal of 19664005937 is 73950046691.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 19664005937 - 2¹⁸ = 19663743793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19664005931) 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, 95456237 + ... + 95456442.

It is an arithmetic number, because the mean of its divisors is an integer number (4963729680).

Almost surely, 2^19664005937 is an apocalyptic number.

It is an amenable number.

19664005937 is a deficient number, since it is larger than the sum of its proper divisors (190912783).

19664005937 is a wasteful number, since it uses less digits than its factorization.

19664005937 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 190912782.

The product of its (nonzero) digits is 1224720, while the sum is 50.

The spelling of 19664005937 in words is "nineteen billion, six hundred sixty-four million, five thousand, nine hundred thirty-seven".