18136117459208 has 32 divisors (see below), whose sum is σ = 38863308980160. Its totient is φ = 7772581740480.

The previous prime is 18136117459199. The next prime is 18136117459223. The reversal of 18136117459208 is 80295471163181.

It is a Smith number, since the sum of its digits (56) coincides with the sum of the digits of its prime factors.

It is a Harshad number since it is a multiple of its sum of digits (56).

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, 11842598 + ... + 13286058.

It is an arithmetic number, because the mean of its divisors is an integer number (1214478405630).

It is a 1-persistent number, because it is pandigital, but 2⋅18136117459208 = 36272234918416 is not.

Almost surely, 2^{18136117459208} is an apocalyptic number.

It is an amenable number.

18136117459208 is an abundant number, since it is smaller than the sum of its proper divisors (20727191520952).

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

18136117459208 is a wasteful number, since it uses less digits than its factorization.

18136117459208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1667837 (or 1667833 counting only the distinct ones).

The product of its (nonzero) digits is 2903040, while the sum is 56.

The spelling of 18136117459208 in words is "eighteen trillion, one hundred thirty-six billion, one hundred seventeen million, four hundred fifty-nine thousand, two hundred eight".