66718008 has 72 divisors (see below), whose sum is σ = 210206880. Its totient is φ = 19061280.

The previous prime is 66717953. The next prime is 66718021. The reversal of 66718008 is 80081766.

66718008 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (72).

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 17 ways as a sum of consecutive naturals, for example, 5928 + ... + 12983.

It is an arithmetic number, because the mean of its divisors is an integer number (2919540).

Almost surely, 2^66718008 is an apocalyptic number.

It is an amenable number.

66718008 is an abundant number, since it is smaller than the sum of its proper divisors (143488872).

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

66718008 is a wasteful number, since it uses less digits than its factorization.

66718008 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18937 (or 18923 counting only the distinct ones).

The product of its (nonzero) digits is 16128, while the sum is 36.

The square root of 66718008 is about 8168.1092059301. The cubic root of 66718008 is about 405.5841957825.

The spelling of 66718008 in words is "sixty-six million, seven hundred eighteen thousand, eight".