19965372684 has 12 divisors (see below), whose sum is σ = 46585869624. Its totient is φ = 6655124224.

The previous prime is 19965372643. The next prime is 19965372719. The reversal of 19965372684 is 48627356991.

It is a tau number, because it is divible by the number of its divisors (12).

It is a super-2 number, since 2×19965372684² (a number of 21 digits) contains 22 as substring.

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, 831890517 + ... + 831890540.

It is an arithmetic number, because the mean of its divisors is an integer number (3882155802).

Almost surely, 2^19965372684 is an apocalyptic number.

It is an amenable number.

19965372684 is an abundant number, since it is smaller than the sum of its proper divisors (26620496940).

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

19965372684 is a wasteful number, since it uses less digits than its factorization.

19965372684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1663781064 (or 1663781062 counting only the distinct ones).

The product of its digits is 19595520, while the sum is 60.

The spelling of 19965372684 in words is "nineteen billion, nine hundred sixty-five million, three hundred seventy-two thousand, six hundred eighty-four".