66600566 has 4 divisors (see below), whose sum is σ = 99900852. Its totient is φ = 33300282.

The previous prime is 66600563. The next prime is 66600581. The reversal of 66600566 is 66500666.

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

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66600563) 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 as a sum of consecutive naturals, namely, 16650140 + ... + 16650143.

It is an arithmetic number, because the mean of its divisors is an integer number (24975213).

Almost surely, 2^66600566 is an apocalyptic number.

66600566 is a deficient number, since it is larger than the sum of its proper divisors (33300286).

66600566 is a wasteful number, since it uses less digits than its factorization.

66600566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33300285.

The product of its (nonzero) digits is 38880, while the sum is 35.

The square root of 66600566 is about 8160.9169827906. The cubic root of 66600566 is about 405.3460761867.

The spelling of 66600566 in words is "sixty-six million, six hundred thousand, five hundred sixty-six".