66665328 has 40 divisors (see below), whose sum is σ = 173203200. Its totient is φ = 22094784.

The previous prime is 66665327. The next prime is 66665329. The reversal of 66665328 is 82356666.

It is an interprime number because it is at equal distance from previous prime (66665327) and next prime (66665329).

It is a self number, because there is not a number n which added to its sum of digits gives 66665328.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66665321) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 4713 + ... + 12471.

It is an arithmetic number, because the mean of its divisors is an integer number (4330080).

Almost surely, 2^66665328 is an apocalyptic number.

It is an amenable number.

66665328 is an abundant number, since it is smaller than the sum of its proper divisors (106537872).

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

66665328 is a wasteful number, since it uses less digits than its factorization.

66665328 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7949 (or 7943 counting only the distinct ones).

The product of its digits is 311040, while the sum is 42.

The square root of 66665328 is about 8164.8838326090. The cubic root of 66665328 is about 405.4774190064.

The spelling of 66665328 in words is "sixty-six million, six hundred sixty-five thousand, three hundred twenty-eight".