18405185166 has 96 divisors (see below), whose sum is σ = 42810273792. Its totient is φ = 5700784320.

The previous prime is 18405185131. The next prime is 18405185213. The reversal of 18405185166 is 66158150481.

18405185166 is a `hidden beast` number, since 1 + 8 + 405 + 1 + 85 + 166 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 3397476 + ... + 3402888.

It is an arithmetic number, because the mean of its divisors is an integer number (445940352).

Almost surely, 2^18405185166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18405185166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (21405136896).

18405185166 is an abundant number, since it is smaller than the sum of its proper divisors (24405088626).

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

18405185166 is a wasteful number, since it uses less digits than its factorization.

18405185166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5678 (or 5675 counting only the distinct ones).

The product of its (nonzero) digits is 230400, while the sum is 45.

The spelling of 18405185166 in words is "eighteen billion, four hundred five million, one hundred eighty-five thousand, one hundred sixty-six".