18430719536 has 20 divisors (see below), whose sum is σ = 37262107632. Its totient is φ = 8814691776.

The previous prime is 18430719521. The next prime is 18430719553. The reversal of 18430719536 is 63591703481.

It is a happy number.

It is a super-2 number, since 2×18430719536² (a number of 21 digits) contains 22 as substring.

It is a Smith number, since the sum of its digits (47) 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 3 ways as a sum of consecutive naturals, for example, 25041371 + ... + 25042106.

Almost surely, 2^18430719536 is an apocalyptic number.

18430719536 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

18430719536 is an abundant number, since it is smaller than the sum of its proper divisors (18831388096).

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

18430719536 is a wasteful number, since it uses less digits than its factorization.

18430719536 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50083508 (or 50083502 counting only the distinct ones).

The product of its (nonzero) digits is 544320, while the sum is 47.

The spelling of 18430719536 in words is "eighteen billion, four hundred thirty million, seven hundred nineteen thousand, five hundred thirty-six".