19866769564 has 12 divisors (see below), whose sum is σ = 34975032624. Its totient is φ = 9873903104.

The previous prime is 19866769519. The next prime is 19866769579. The reversal of 19866769564 is 46596766891.

It is a self number, because there is not a number n which added to its sum of digits gives 19866769564.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 14869669 + ... + 14871004.

It is an arithmetic number, because the mean of its divisors is an integer number (2914586052).

Almost surely, 2^19866769564 is an apocalyptic number.

It is an amenable number.

19866769564 is a deficient number, since it is larger than the sum of its proper divisors (15108263060).

19866769564 is a wasteful number, since it uses less digits than its factorization.

19866769564 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 29740844 (or 29740842 counting only the distinct ones).

The product of its digits is 117573120, while the sum is 67.

The spelling of 19866769564 in words is "nineteen billion, eight hundred sixty-six million, seven hundred sixty-nine thousand, five hundred sixty-four".