19917384612 has 48 divisors (see below), whose sum is σ = 48745898880. Its totient is φ = 6317549568.

The previous prime is 19917384611. The next prime is 19917384623. The reversal of 19917384612 is 21648371991.

It is not an unprimeable number, because it can be changed into a prime (19917384611) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 133687 + ... + 240222.

It is an arithmetic number, because the mean of its divisors is an integer number (1015539560).

Almost surely, 2^19917384612 is an apocalyptic number.

19917384612 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

19917384612 is an abundant number, since it is smaller than the sum of its proper divisors (28828514268).

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

19917384612 is a wasteful number, since it uses less digits than its factorization.

19917384612 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 374132 (or 374130 counting only the distinct ones).

The product of its digits is 653184, while the sum is 51.

The spelling of 19917384612 in words is "nineteen billion, nine hundred seventeen million, three hundred eighty-four thousand, six hundred twelve".