19197799900 has 36 divisors (see below), whose sum is σ = 43095757320. Its totient is φ = 7414321600.

The previous prime is 19197799897. The next prime is 19197799969. The reversal of 19197799900 is 999779191.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3307066 + ... + 3312865.

It is an arithmetic number, because the mean of its divisors is an integer number (1197104370).

Almost surely, 2^19197799900 is an apocalyptic number.

19197799900 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

19197799900 is an abundant number, since it is smaller than the sum of its proper divisors (23897957420).

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

19197799900 is a wasteful number, since it uses less digits than its factorization.

19197799900 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6619974 (or 6619967 counting only the distinct ones).

The product of its (nonzero) digits is 2893401, while the sum is 61.

The spelling of 19197799900 in words is "nineteen billion, one hundred ninety-seven million, seven hundred ninety-nine thousand, nine hundred".