66718908 has 36 divisors (see below), whose sum is σ = 174468840. Its totient is φ = 21472416.

The previous prime is 66718903. The next prime is 66718919. The reversal of 66718908 is 80981766.

It is a happy number.

It is a tau number, because it is divible by the number of its divisors (36).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66718903) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 30910 + ... + 32997.

Almost surely, 2^66718908 is an apocalyptic number.

It is an amenable number.

66718908 is an abundant number, since it is smaller than the sum of its proper divisors (107749932).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66718908 is a wasteful number, since it uses less digits than its factorization.

66718908 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 63946 (or 63941 counting only the distinct ones).

The product of its (nonzero) digits is 145152, while the sum is 45.

The square root of 66718908 is about 8168.1642980538. The cubic root of 66718908 is about 405.5860194987.

The spelling of 66718908 in words is "sixty-six million, seven hundred eighteen thousand, nine hundred eight".