19519205136 has 20 divisors (see below), whose sum is σ = 50424613392. Its totient is φ = 6506401696.

The previous prime is 19519205119. The next prime is 19519205137. The reversal of 19519205136 is 63150291591.

It is not an unprimeable number, because it can be changed into a prime (19519205137) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203325006 + ... + 203325101.

Almost surely, 2^19519205136 is an apocalyptic number.

19519205136 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19519205136 is an abundant number, since it is smaller than the sum of its proper divisors (30905408256).

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

19519205136 is a wasteful number, since it uses less digits than its factorization.

19519205136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 406650118 (or 406650112 counting only the distinct ones).

The product of its (nonzero) digits is 72900, while the sum is 42.

The spelling of 19519205136 in words is "nineteen billion, five hundred nineteen million, two hundred five thousand, one hundred thirty-six".