18171618012 has 54 divisors (see below), whose sum is σ = 48478656408. Its totient is φ = 5738401584.

The previous prime is 18171617963. The next prime is 18171618029. The reversal of 18171618012 is 21081617181.

18171618012 is a `hidden beast` number, since 18 + 17 + 1 + 618 + 0 + 12 = 666.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 686128 + ... + 712119.

Almost surely, 2^18171618012 is an apocalyptic number.

18171618012 is a gapful number since it is divisible by the number (12) formed by its first and last digit.

It is an amenable number.

18171618012 is an abundant number, since it is smaller than the sum of its proper divisors (30307038396).

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

18171618012 is a wasteful number, since it uses less digits than its factorization.

18171618012 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1398295 (or 1398271 counting only the distinct ones).

The product of its (nonzero) digits is 5376, while the sum is 36.

The spelling of 18171618012 in words is "eighteen billion, one hundred seventy-one million, six hundred eighteen thousand, twelve".