18213985186 has 8 divisors (see below), whose sum is σ = 27327607020. Its totient is φ = 9104782848.

The previous prime is 18213985169. The next prime is 18213985201. The reversal of 18213985186 is 68158931281.

It can be written as a sum of positive squares in 2 ways, for example, as 17139784561 + 1074200625 = 130919^2 + 32775^2 .

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

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1094551 + ... + 1111066.

Almost surely, 2^18213985186 is an apocalyptic number.

18213985186 is a deficient number, since it is larger than the sum of its proper divisors (9113621834).

18213985186 is a wasteful number, since it uses less digits than its factorization.

18213985186 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2209748.

The product of its digits is 829440, while the sum is 52.

The spelling of 18213985186 in words is "eighteen billion, two hundred thirteen million, nine hundred eighty-five thousand, one hundred eighty-six".