66964666 has 32 divisors (see below), whose sum is σ = 109175040. Its totient is φ = 30690816.

The previous prime is 66964663. The next prime is 66964673. The reversal of 66964666 is 66646966.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (66964663) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 287286 + ... + 287518.

It is an arithmetic number, because the mean of its divisors is an integer number (3411720).

Almost surely, 2^66964666 is an apocalyptic number.

66964666 is a deficient number, since it is larger than the sum of its proper divisors (42210374).

66964666 is a wasteful number, since it uses less digits than its factorization.

66964666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 438.

The product of its digits is 1679616, while the sum is 49.

The square root of 66964666 is about 8183.1941196577. The cubic root of 66964666 is about 406.0833991113.

The spelling of 66964666 in words is "sixty-six million, nine hundred sixty-four thousand, six hundred sixty-six".