66819330 has 40 divisors (see below), whose sum is σ = 179671932. Its totient is φ = 17818272.

The previous prime is 66819317. The next prime is 66819359. The reversal of 66819330 is 3391866.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 57289761 + 9529569 = 7569^2 + 3087^2 .

It is a hoax number, since the sum of its digits (36) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 40437 + ... + 42056.

Almost surely, 2^66819330 is an apocalyptic number.

66819330 is an abundant number, since it is smaller than the sum of its proper divisors (112852602).

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

66819330 is a wasteful number, since it uses less digits than its factorization.

66819330 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82512 (or 82503 counting only the distinct ones).

The product of its (nonzero) digits is 23328, while the sum is 36.

The square root of 66819330 is about 8174.3091451205. The cubic root of 66819330 is about 405.7894068279.

The spelling of 66819330 in words is "sixty-six million, eight hundred nineteen thousand, three hundred thirty".