18418751985 has 8 divisors (see below), whose sum is σ = 29470003200. Its totient is φ = 9823334384.

The previous prime is 18418751927. The next prime is 18418751999. The reversal of 18418751985 is 58915781481.

It is a happy number.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18418751985 - 2¹⁸ = 18418489841 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 613958385 + ... + 613958414.

It is an arithmetic number, because the mean of its divisors is an integer number (3683750400).

Almost surely, 2^18418751985 is an apocalyptic number.

18418751985 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18418751985 is a deficient number, since it is larger than the sum of its proper divisors (11051251215).

18418751985 is a wasteful number, since it uses less digits than its factorization.

18418751985 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1227916807.

The product of its digits is 3225600, while the sum is 57.

The spelling of 18418751985 in words is "eighteen billion, four hundred eighteen million, seven hundred fifty-one thousand, nine hundred eighty-five".