66764566 has 16 divisors (see below), whose sum is σ = 110792448. Its totient is φ = 29919400.

The previous prime is 66764563. The next prime is 66764567. The reversal of 66764566 is 66546766.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66764563) 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, 19810 + ... + 22933.

It is an arithmetic number, because the mean of its divisors is an integer number (6924528).

Almost surely, 2^66764566 is an apocalyptic number.

66764566 is a deficient number, since it is larger than the sum of its proper divisors (44027882).

66764566 is a wasteful number, since it uses less digits than its factorization.

66764566 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42827.

The product of its digits is 1088640, while the sum is 46.

The square root of 66764566 is about 8170.9586952817. The cubic root of 66764566 is about 405.6785171351.

The spelling of 66764566 in words is "sixty-six million, seven hundred sixty-four thousand, five hundred sixty-six".