66772166 has 4 divisors (see below), whose sum is σ = 100158252. Its totient is φ = 33386082.

The previous prime is 66772159. The next prime is 66772187. The reversal of 66772166 is 66127766.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66127766 = 2 ⋅33063883.

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 as a sum of consecutive naturals, namely, 16693040 + ... + 16693043.

It is an arithmetic number, because the mean of its divisors is an integer number (25039563).

Almost surely, 2^66772166 is an apocalyptic number.

66772166 is a deficient number, since it is larger than the sum of its proper divisors (33386086).

66772166 is a wasteful number, since it uses less digits than its factorization.

66772166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33386085.

The product of its digits is 127008, while the sum is 41.

The square root of 66772166 is about 8171.4237437548. The cubic root of 66772166 is about 405.6939097299.

The spelling of 66772166 in words is "sixty-six million, seven hundred seventy-two thousand, one hundred sixty-six".