19816563672 has 48 divisors (see below), whose sum is σ = 56826914040. Its totient is φ = 6216960768.

The previous prime is 19816563643. The next prime is 19816563673. The reversal of 19816563672 is 27636561891.

19816563672 is a `hidden beast` number, since 1 + 9 + 8 + 1 + 6 + 563 + 6 + 72 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19816563673) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 8093778 + ... + 8096225.

Almost surely, 2^19816563672 is an apocalyptic number.

19816563672 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19816563672 is an abundant number, since it is smaller than the sum of its proper divisors (37010350368).

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

19816563672 is a wasteful number, since it uses less digits than its factorization.

19816563672 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16190032 (or 16190025 counting only the distinct ones).

The product of its digits is 3265920, while the sum is 54.

The spelling of 19816563672 in words is "nineteen billion, eight hundred sixteen million, five hundred sixty-three thousand, six hundred seventy-two".