66664308 has 24 divisors (see below), whose sum is σ = 157521280. Its totient is φ = 21939840.

The previous prime is 66664307. The next prime is 66664321. The reversal of 66664308 is 80346666.

It is a super-2 number, since 2×66664308² = 8888259922237728, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66664307) by changing a digit.

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, 34213 + ... + 36108.

Almost surely, 2^66664308 is an apocalyptic number.

It is an amenable number.

66664308 is an abundant number, since it is smaller than the sum of its proper divisors (90856972).

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

66664308 is a wasteful number, since it uses less digits than its factorization.

66664308 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 70407 (or 70405 counting only the distinct ones).

The product of its (nonzero) digits is 124416, while the sum is 39.

The square root of 66664308 is about 8164.8213697545. The cubic root of 66664308 is about 405.4753510195.

The spelling of 66664308 in words is "sixty-six million, six hundred sixty-four thousand, three hundred eight".