19917393160 has 32 divisors (see below), whose sum is σ = 51216154560. Its totient is φ = 6828820416.

The previous prime is 19917393149. The next prime is 19917393173. The reversal of 19917393160 is 6139371991.

It is a Smith number, since the sum of its digits (49) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 35566494 + ... + 35567053.

It is an arithmetic number, because the mean of its divisors is an integer number (1600504830).

Almost surely, 2^19917393160 is an apocalyptic number.

19917393160 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19917393160 is an abundant number, since it is smaller than the sum of its proper divisors (31298761400).

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

19917393160 is a wasteful number, since it uses less digits than its factorization.

19917393160 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 71133565 (or 71133561 counting only the distinct ones).

The product of its (nonzero) digits is 275562, while the sum is 49.

The spelling of 19917393160 in words is "nineteen billion, nine hundred seventeen million, three hundred ninety-three thousand, one hundred sixty".