66155166 has 96 divisors (see below), whose sum is σ = 181958400. Its totient is φ = 16871040.

The previous prime is 66155137. The next prime is 66155191.

66155166 is nontrivially palindromic in base 10.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 66155166.

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, 81370 + ... + 82178.

It is an arithmetic number, because the mean of its divisors is an integer number (1895400).

Almost surely, 2^66155166 is an apocalyptic number.

66155166 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 66155166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (90979200).

66155166 is an abundant number, since it is smaller than the sum of its proper divisors (115803234).

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

66155166 is a wasteful number, since it uses less digits than its factorization.

66155166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 894 (or 891 counting only the distinct ones).

The product of its digits is 32400, while the sum is 36.

The square root of 66155166 is about 8133.5826054697. The cubic root of 66155166 is about 404.4404527094.

It can be divided in two parts, 6615 and 5166, that added together give a triangular number (11781 = T₁₅₃).

The spelling of 66155166 in words is "sixty-six million, one hundred fifty-five thousand, one hundred sixty-six".