18811219716 has 27 divisors (see below), whose sum is σ = 47552663431. Its totient is φ = 6270132264.

The previous prime is 18811219681. The next prime is 18811219733. The reversal of 18811219716 is 61791211881.

The square root of 18811219716 is 137154.

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

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, 811495 + ... + 834353.

Almost surely, 2^18811219716 is an apocalyptic number.

18811219716 is the 137154-th square number.

It is an amenable number.

18811219716 is an abundant number, since it is smaller than the sum of its proper divisors (28741443715).

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

18811219716 is an frugal number, since it uses more digits than its factorization.

18811219716 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45728 (or 22864 counting only the distinct ones).

The product of its digits is 48384, while the sum is 45.

The spelling of 18811219716 in words is "eighteen billion, eight hundred eleven million, two hundred nineteen thousand, seven hundred sixteen".