18822193636 has 9 divisors (see below), whose sum is σ = 32939319049. Its totient is φ = 9410959624.

The previous prime is 18822193633. The next prime is 18822193661. The reversal of 18822193636 is 63639122881.

The square root of 18822193636 is 137194.

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., 2115080100 + 16707113536 = 45990^2 + 129256^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18822193636.

It is not an unprimeable number, because it can be changed into a prime (18822193633) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 2 ways as a sum of consecutive naturals, for example, 240090 + ... + 308686.

Almost surely, 2^18822193636 is an apocalyptic number.

18822193636 is the 137194-th square number.

It is an amenable number.

18822193636 is a deficient number, since it is larger than the sum of its proper divisors (14117125413).

18822193636 is an frugal number, since it uses more digits than its factorization.

18822193636 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 137198 (or 68599 counting only the distinct ones).

The product of its digits is 746496, while the sum is 49.

Multiplying 18822193636 by its sum of digits (49), we get a square (922287488164 = 960358²).

The spelling of 18822193636 in words is "eighteen billion, eight hundred twenty-two million, one hundred ninety-three thousand, six hundred thirty-six".