18538456336 has 15 divisors (see below), whose sum is σ = 35919314391. Its totient is φ = 9268955856.

The previous prime is 18538456333. The next prime is 18538456337. The reversal of 18538456336 is 63365483581.

The square root of 18538456336 is 136156.

It is a perfect power (a square), and thus also a powerful number.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18538456331) by changing a digit.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 527605 + ... + 561643.

Almost surely, 2^18538456336 is an apocalyptic number.

18538456336 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18538456336 is the 136156-th square number.

It is an amenable number.

18538456336 is a deficient number, since it is larger than the sum of its proper divisors (17380858055).

18538456336 is an frugal number, since it uses more digits than its factorization.

18538456336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 68086 (or 34041 counting only the distinct ones).

The product of its digits is 6220800, while the sum is 52.

The spelling of 18538456336 in words is "eighteen billion, five hundred thirty-eight million, four hundred fifty-six thousand, three hundred thirty-six".