66171608 has 16 divisors (see below), whose sum is σ = 128074560. Its totient is φ = 32018400.

The previous prime is 66171607. The next prime is 66171619. The reversal of 66171608 is 80617166.

It is a Smith number, since the sum of its digits (35) coincides with the sum of the digits of its prime factors.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66171601) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 133163 + ... + 133658.

It is an arithmetic number, because the mean of its divisors is an integer number (8004660).

Almost surely, 2^66171608 is an apocalyptic number.

It is an amenable number.

66171608 is a deficient number, since it is larger than the sum of its proper divisors (61902952).

66171608 is a wasteful number, since it uses less digits than its factorization.

66171608 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 266858 (or 266854 counting only the distinct ones).

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 66171608 is about 8134.5932903864. The cubic root of 66171608 is about 404.4739560597.

The spelling of 66171608 in words is "sixty-six million, one hundred seventy-one thousand, six hundred eight".