19666869172 has 12 divisors (see below), whose sum is σ = 34435350880. Its totient is φ = 9828197496.

The previous prime is 19666869149. The next prime is 19666869181. The reversal of 19666869172 is 27196866691.

It is a hoax number, since the sum of its digits (61) coincides with the sum of the digits of its distinct prime factors.

It is a self number, because there is not a number n which added to its sum of digits gives 19666869172.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1300818 + ... + 1315849.

Almost surely, 2^19666869172 is an apocalyptic number.

It is an amenable number.

19666869172 is a deficient number, since it is larger than the sum of its proper divisors (14768481708).

19666869172 is a wasteful number, since it uses less digits than its factorization.

19666869172 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2618550 (or 2618548 counting only the distinct ones).

The product of its digits is 11757312, while the sum is 61.

The spelling of 19666869172 in words is "nineteen billion, six hundred sixty-six million, eight hundred sixty-nine thousand, one hundred seventy-two".