66818008 has 8 divisors (see below), whose sum is σ = 125283780. Its totient is φ = 33409000.

The previous prime is 66817979. The next prime is 66818009. The reversal of 66818008 is 80081866.

It is a tau number, because it is divible by the number of its divisors (8).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66818009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4176118 + ... + 4176133.

Almost surely, 2^66818008 is an apocalyptic number.

It is an amenable number.

66818008 is a deficient number, since it is larger than the sum of its proper divisors (58465772).

66818008 is a wasteful number, since it uses less digits than its factorization.

66818008 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8352257 (or 8352253 counting only the distinct ones).

The product of its (nonzero) digits is 18432, while the sum is 37.

The square root of 66818008 is about 8174.2282816178. The cubic root of 66818008 is about 405.7867306705.

The spelling of 66818008 in words is "sixty-six million, eight hundred eighteen thousand, eight".