18519903090 has 48 divisors (see below), whose sum is σ = 51855731928. Its totient is φ = 4558745088.

The previous prime is 18519903047. The next prime is 18519903091. The reversal of 18519903090 is 9030991581.

18519903090 is a `hidden beast` number, since 18 + 519 + 9 + 0 + 30 + 90 = 666.

It can be written as a sum of positive squares in 4 ways, for example, as 6817639761 + 11702263329 = 82569^2 + 108177^2 .

It is a Harshad number since it is a multiple of its sum of digits (45).

It is not an unprimeable number, because it can be changed into a prime (18519903091) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 7913319 + ... + 7915658.

Almost surely, 2^18519903090 is an apocalyptic number.

18519903090 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

18519903090 is an abundant number, since it is smaller than the sum of its proper divisors (33335828838).

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

18519903090 is a wasteful number, since it uses less digits than its factorization.

18519903090 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15829003 (or 15829000 counting only the distinct ones).

The product of its (nonzero) digits is 87480, while the sum is 45.

The spelling of 18519903090 in words is "eighteen billion, five hundred nineteen million, nine hundred three thousand, ninety".