18217232688 has 20 divisors (see below), whose sum is σ = 47061184568. Its totient is φ = 6072410880.

The previous prime is 18217232651. The next prime is 18217232689. The reversal of 18217232688 is 88623271281.

It is a Harshad number since it is a multiple of its sum of digits (48), and also a Moran number because the ratio is a prime number: 379525681 = 18217232688 / (1 + 8 + 2 + 1 + 7 + 2 + 3 + 2 + 6 + 8 + 8).

It is not an unprimeable number, because it can be changed into a prime (18217232689) 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 3 ways as a sum of consecutive naturals, for example, 189762793 + ... + 189762888.

Almost surely, 2^18217232688 is an apocalyptic number.

It is an amenable number.

18217232688 is an abundant number, since it is smaller than the sum of its proper divisors (28843951880).

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

18217232688 is a wasteful number, since it uses less digits than its factorization.

18217232688 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 379525692 (or 379525686 counting only the distinct ones).

The product of its digits is 516096, while the sum is 48.

The spelling of 18217232688 in words is "eighteen billion, two hundred seventeen million, two hundred thirty-two thousand, six hundred eighty-eight".