66650566 has 4 divisors (see below), whose sum is σ = 99975852. Its totient is φ = 33325282.

The previous prime is 66650513. The next prime is 66650593. The reversal of 66650566 is 66505666.

It is a happy number.

66650566 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 16662640 + ... + 16662643.

It is an arithmetic number, because the mean of its divisors is an integer number (24993963).

Almost surely, 2^66650566 is an apocalyptic number.

66650566 is a deficient number, since it is larger than the sum of its proper divisors (33325286).

66650566 is a wasteful number, since it uses less digits than its factorization.

66650566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33325285.

The product of its (nonzero) digits is 194400, while the sum is 40.

The square root of 66650566 is about 8163.9797892939. The cubic root of 66650566 is about 405.4474879077.

The spelling of 66650566 in words is "sixty-six million, six hundred fifty thousand, five hundred sixty-six".