18863374336 has 135 divisors (see below), whose sum is σ = 40155860199. Its totient is φ = 8860336128.

The previous prime is 18863374333. The next prime is 18863374337. The reversal of 18863374336 is 63347336881.

It is a happy number.

The square root of 18863374336 is 137344.

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

It can be written as a sum of positive squares in 4 ways, for example, as 4014489600 + 14848884736 = 63360^2 + 121856^2 .

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18863374333) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 509820910 + ... + 509820946.

Almost surely, 2^18863374336 is an apocalyptic number.

18863374336 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18863374336 is the 137344-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18863374336

18863374336 is an abundant number, since it is smaller than the sum of its proper divisors (21292485863).

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

18863374336 is an frugal number, since it uses more digits than its factorization.

18863374336 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 160 (or 68 counting only the distinct ones).

The product of its digits is 5225472, while the sum is 52.

The spelling of 18863374336 in words is "eighteen billion, eight hundred sixty-three million, three hundred seventy-four thousand, three hundred thirty-six".