66640676 has 12 divisors (see below), whose sum is σ = 122759280. Its totient is φ = 31566600.

The previous prime is 66640667. The next prime is 66640699. The reversal of 66640676 is 67604666.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 438350 + ... + 438501.

It is an arithmetic number, because the mean of its divisors is an integer number (10229940).

Almost surely, 2^66640676 is an apocalyptic number.

It is an amenable number.

66640676 is a deficient number, since it is larger than the sum of its proper divisors (56118604).

66640676 is a wasteful number, since it uses less digits than its factorization.

66640676 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 876874 (or 876872 counting only the distinct ones).

The product of its (nonzero) digits is 217728, while the sum is 41.

The square root of 66640676 is about 8163.3740573368. The cubic root of 66640676 is about 405.4274326942.

The spelling of 66640676 in words is "sixty-six million, six hundred forty thousand, six hundred seventy-six".