66580066 has 16 divisors (see below), whose sum is σ = 120144960. Its totient is φ = 27032400.

The previous prime is 66580049. The next prime is 66580081. The reversal of 66580066 is 66008566.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 124885 + ... + 125416.

It is an arithmetic number, because the mean of its divisors is an integer number (7509060).

Almost surely, 2^66580066 is an apocalyptic number.

66580066 is a deficient number, since it is larger than the sum of its proper divisors (53564894).

66580066 is a wasteful number, since it uses less digits than its factorization.

66580066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 250329.

The product of its (nonzero) digits is 51840, while the sum is 37.

The square root of 66580066 is about 8159.6608998169. The cubic root of 66580066 is about 405.3044827099.

The spelling of 66580066 in words is "sixty-six million, five hundred eighty thousand, sixty-six".