18703844644 has 81 divisors (see below), whose sum is σ = 35726073201. Its totient is φ = 8566771680.

The previous prime is 18703844629. The next prime is 18703844683. The reversal of 18703844644 is 44644830781.

The square root of 18703844644 is 136762.

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., 608214244 + 18095630400 = 24662^2 + 134520^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 306620374 + ... + 306620434.

Almost surely, 2^18703844644 is an apocalyptic number.

18703844644 is the 136762-nd square number.

It is an amenable number.

18703844644 is a deficient number, since it is larger than the sum of its proper divisors (17022228557).

18703844644 is an equidigital number, since it uses as much as digits as its factorization.

18703844644 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 282 (or 141 counting only the distinct ones).

The product of its (nonzero) digits is 2064384, while the sum is 49.

Multiplying 18703844644 by its sum of digits (49), we get a square (916488387556 = 957334²).

The spelling of 18703844644 in words is "eighteen billion, seven hundred three million, eight hundred forty-four thousand, six hundred forty-four".