66716166 has 32 divisors (see below), whose sum is σ = 146458368. Its totient is φ = 20092640.

The previous prime is 66716149. The next prime is 66716189. The reversal of 66716166 is 66161766.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 7996 + ... + 14048.

It is an arithmetic number, because the mean of its divisors is an integer number (4576824).

Almost surely, 2^66716166 is an apocalyptic number.

66716166 is a gapful number since it is divisible by the number (66) formed by its first and last digit.

66716166 is an abundant number, since it is smaller than the sum of its proper divisors (79742202).

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

66716166 is a wasteful number, since it uses less digits than its factorization.

66716166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6236.

The product of its digits is 54432, while the sum is 39.

The square root of 66716166 is about 8167.9964495585. The cubic root of 66716166 is about 405.5804631923.

The spelling of 66716166 in words is "sixty-six million, seven hundred sixteen thousand, one hundred sixty-six".