18351812388 has 96 divisors (see below), whose sum is σ = 54402826240. Its totient is φ = 4683899520.

The previous prime is 18351812387. The next prime is 18351812389. The reversal of 18351812388 is 88321815381.

It is an interprime number because it is at equal distance from previous prime (18351812387) and next prime (18351812389).

It is not an unprimeable number, because it can be changed into a prime (18351812387) 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 31 ways as a sum of consecutive naturals, for example, 237208 + ... + 304911.

Almost surely, 2^18351812388 is an apocalyptic number.

It is an amenable number.

18351812388 is an abundant number, since it is smaller than the sum of its proper divisors (36051013852).

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

18351812388 is a wasteful number, since it uses less digits than its factorization.

18351812388 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 542177 (or 542175 counting only the distinct ones).

The product of its digits is 368640, while the sum is 48.

The spelling of 18351812388 in words is "eighteen billion, three hundred fifty-one million, eight hundred twelve thousand, three hundred eighty-eight".