18908199902736 has 45 divisors (see below), whose sum is σ = 52916844371599. Its totient is φ = 6302715907488.

The previous prime is 18908199902723. The next prime is 18908199902741. The reversal of 18908199902736 is 63720999180981.

The square root of 18908199902736 is 4348356.

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

18908199902736 is a `hidden beast` number, since 1 + 89 + 0 + 8 + 199 + 90 + 273 + 6 = 666.

It is a Harshad number since it is a multiple of its sum of digits (72).

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 51999091 + ... + 52361453.

Almost surely, 2^{18908199902736} is an apocalyptic number.

18908199902736 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18908199902736 is the 4348356-th square number.

It is an amenable number.

18908199902736 is an abundant number, since it is smaller than the sum of its proper divisors (34008644468863).

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

18908199902736 is an frugal number, since it uses more digits than its factorization.

18908199902736 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 724740 (or 362368 counting only the distinct ones).

The product of its (nonzero) digits is 105815808, while the sum is 72.

The spelling of 18908199902736 in words is "eighteen trillion, nine hundred eight billion, one hundred ninety-nine million, nine hundred two thousand, seven hundred thirty-six".