66512330 has 16 divisors (see below), whose sum is σ = 126765000. Its totient is φ = 25039872.

The previous prime is 66512323. The next prime is 66512393. The reversal of 66512330 is 3321566.

It can be written as a sum of positive squares in 4 ways, for example, as 42237001 + 24275329 = 6499^2 + 4927^2 .

It is a self number, because there is not a number n which added to its sum of digits gives 66512330.

It is an unprimeable number.

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, 195455 + ... + 195794.

Almost surely, 2^66512330 is an apocalyptic number.

66512330 is a deficient number, since it is larger than the sum of its proper divisors (60252670).

66512330 is a wasteful number, since it uses less digits than its factorization.

66512330 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 391273.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 66512330 is about 8155.5091809157. The cubic root of 66512330 is about 405.1669890051.

Adding to 66512330 its reverse (3321566), we get a palindrome (69833896).

The spelling of 66512330 in words is "sixty-six million, five hundred twelve thousand, three hundred thirty".