19664005938 has 8 divisors (see below), whose sum is σ = 39328011888. Its totient is φ = 6554668644.

The previous prime is 19664005931. The next prime is 19664005973. The reversal of 19664005938 is 83950046691.

It is a sphenic number, since it is the product of 3 distinct primes.

19664005938 is an admirable 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, 1638667156 + ... + 1638667167.

It is an arithmetic number, because the mean of its divisors is an integer number (4916001486).

Almost surely, 2^19664005938 is an apocalyptic number.

19664005938 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19664005938 is a wasteful number, since it uses less digits than its factorization.

19664005938 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3277334328.

The product of its (nonzero) digits is 1399680, while the sum is 51.

The spelling of 19664005938 in words is "nineteen billion, six hundred sixty-four million, five thousand, nine hundred thirty-eight".