66616166 has 32 divisors (see below), whose sum is σ = 112583520. Its totient is φ = 29376000.

The previous prime is 66616139. The next prime is 66616171. The reversal of 66616166 is 66161666.

It is a Harshad number since it is a multiple of its sum of digits (38).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 64736 + ... + 65756.

It is an arithmetic number, because the mean of its divisors is an integer number (3518235).

Almost surely, 2^66616166 is an apocalyptic number.

66616166 is a deficient number, since it is larger than the sum of its proper divisors (45967354).

66616166 is a wasteful number, since it uses less digits than its factorization.

66616166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1160.

The product of its digits is 46656, while the sum is 38.

The square root of 66616166 is about 8161.8727017762. The cubic root of 66616166 is about 405.3777220896.

The spelling of 66616166 in words is "sixty-six million, six hundred sixteen thousand, one hundred sixty-six".