66188166 has 16 divisors (see below), whose sum is σ = 144410688. Its totient is φ = 20057000.

The previous prime is 66188141. The next prime is 66188183.

66188166 is nontrivially palindromic in base 10.

It is a congruent number.

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, 501360 + ... + 501491.

It is an arithmetic number, because the mean of its divisors is an integer number (9025668).

Almost surely, 2^66188166 is an apocalyptic number.

66188166 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66188166 is an abundant number, since it is smaller than the sum of its proper divisors (78222522).

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

66188166 is a wasteful number, since it uses less digits than its factorization.

66188166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1002867.

The product of its digits is 82944, while the sum is 42.

The square root of 66188166 is about 8135.6109789001. The cubic root of 66188166 is about 404.5076901713.

The spelling of 66188166 in words is "sixty-six million, one hundred eighty-eight thousand, one hundred sixty-six".