19664502748 has 48 divisors (see below), whose sum is σ = 37920072960. Its totient is φ = 8848569600.

The previous prime is 19664502743. The next prime is 19664502749. The reversal of 19664502748 is 84720546691.

It is a Smith number, since the sum of its digits (52) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 19664502695 and 19664502704.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19664502743) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2491873 + ... + 2499751.

It is an arithmetic number, because the mean of its divisors is an integer number (790001520).

Almost surely, 2^19664502748 is an apocalyptic number.

It is an amenable number.

19664502748 is a deficient number, since it is larger than the sum of its proper divisors (18255570212).

19664502748 is a wasteful number, since it uses less digits than its factorization.

19664502748 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8458 (or 8456 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 52.

The spelling of 19664502748 in words is "nineteen billion, six hundred sixty-four million, five hundred two thousand, seven hundred forty-eight".