66615166 has 16 divisors (see below), whose sum is σ = 101082384. Its totient is φ = 32923584.

The previous prime is 66615139. The next prime is 66615167. The reversal of 66615166 is 66151666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66615167) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 75520 + ... + 76396.

It is an arithmetic number, because the mean of its divisors is an integer number (6317649).

Almost surely, 2^66615166 is an apocalyptic number.

66615166 is a deficient number, since it is larger than the sum of its proper divisors (34467218).

66615166 is a wasteful number, since it uses less digits than its factorization.

66615166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1275.

The product of its digits is 38880, while the sum is 37.

The square root of 66615166 is about 8161.8114410957. The cubic root of 66615166 is about 405.3756936543.

The spelling of 66615166 in words is "sixty-six million, six hundred fifteen thousand, one hundred sixty-six".