66916684 has 12 divisors (see below), whose sum is σ = 117230904. Its totient is φ = 33422144.

The previous prime is 66916667. The next prime is 66916721. The reversal of 66916684 is 48661966.

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, 4654 + ... + 12469.

It is an arithmetic number, because the mean of its divisors is an integer number (9769242).

Almost surely, 2^66916684 is an apocalyptic number.

It is an amenable number.

66916684 is a deficient number, since it is larger than the sum of its proper divisors (50314220).

66916684 is a wasteful number, since it uses less digits than its factorization.

66916684 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 18104 (or 18102 counting only the distinct ones).

The product of its digits is 373248, while the sum is 46.

The square root of 66916684 is about 8180.2618539995. The cubic root of 66916684 is about 405.9863860125.

It can be divided in two parts, 66916 and 684, that added together give a square (67600 = 260²).

The spelling of 66916684 in words is "sixty-six million, nine hundred sixteen thousand, six hundred eighty-four".