19668643975 has 48 divisors (see below), whose sum is σ = 25329752800. Its totient is φ = 15140805120.

The previous prime is 19668643963. The next prime is 19668644011. The reversal of 19668643975 is 57934686691.

It is not a de Polignac number, because 19668643975 - 2⁷ = 19668643847 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 26832709 + ... + 26833441.

Almost surely, 2^19668643975 is an apocalyptic number.

19668643975 is a deficient number, since it is larger than the sum of its proper divisors (5661108825).

19668643975 is a wasteful number, since it uses less digits than its factorization.

19668643975 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1124 (or 1119 counting only the distinct ones).

The product of its digits is 58786560, while the sum is 64.

The spelling of 19668643975 in words is "nineteen billion, six hundred sixty-eight million, six hundred forty-three thousand, nine hundred seventy-five".