18213985185 has 16 divisors (see below), whose sum is σ = 31791683520. Its totient is φ = 8831023040.

The previous prime is 18213985169. The next prime is 18213985201. The reversal of 18213985185 is 58158931281.

It is an interprime number because it is at equal distance from previous prime (18213985169) and next prime (18213985201).

It is not a de Polignac number, because 18213985185 - 2⁴ = 18213985169 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 55193730 + ... + 55194059.

It is an arithmetic number, because the mean of its divisors is an integer number (1986980220).

Almost surely, 2^18213985185 is an apocalyptic number.

18213985185 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18213985185 is a deficient number, since it is larger than the sum of its proper divisors (13577698335).

18213985185 is a wasteful number, since it uses less digits than its factorization.

18213985185 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 110387808.

The product of its digits is 691200, while the sum is 51.

The spelling of 18213985185 in words is "eighteen billion, two hundred thirteen million, nine hundred eighty-five thousand, one hundred eighty-five".