66742166 has 16 divisors (see below), whose sum is σ = 104274000. Its totient is φ = 31999968.

The previous prime is 66742141. The next prime is 66742199. The reversal of 66742166 is 66124766.

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 (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4781 + ... + 12503.

It is an arithmetic number, because the mean of its divisors is an integer number (6517125).

Almost surely, 2^66742166 is an apocalyptic number.

66742166 is a deficient number, since it is larger than the sum of its proper divisors (37531834).

66742166 is a wasteful number, since it uses less digits than its factorization.

66742166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7903.

The product of its digits is 72576, while the sum is 38.

The square root of 66742166 is about 8169.5878721022. The cubic root of 66742166 is about 405.6331426907.

The spelling of 66742166 in words is "sixty-six million, seven hundred forty-two thousand, one hundred sixty-six".