18816873216964 has 9 divisors (see below), whose sum is σ = 32929543312141. Its totient is φ = 9408432270640.

The previous prime is 18816873216943. The next prime is 18816873216979. The reversal of 18816873216964 is 46961237861881.

The square root of 18816873216964 is 4337842.

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

It can be written as a sum of positive squares in only one way, i.e., 8091510215364 + 10725363001600 = 2844558^2 + 3274960^2 .

It is a super-2 number, since 2×18816873216964² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 18816873216893 and 18816873216902.

It is an unprimeable number.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 7591224 + ... + 9760144.

Almost surely, 2^{18816873216964} is an apocalyptic number.

18816873216964 is the 4337842-nd square number.

It is an amenable number.

18816873216964 is a deficient number, since it is larger than the sum of its proper divisors (14112670095177).

18816873216964 is an frugal number, since it uses more digits than its factorization.

18816873216964 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4337846 (or 2168923 counting only the distinct ones).

The product of its digits is 167215104, while the sum is 70.

The spelling of 18816873216964 in words is "eighteen trillion, eight hundred sixteen billion, eight hundred seventy-three million, two hundred sixteen thousand, nine hundred sixty-four".