66685000 has 40 divisors (see below), whose sum is σ = 156254670. Its totient is φ = 26672000.

The previous prime is 66684997. The next prime is 66685039. The reversal of 66685000 is 58666.

It can be written as a sum of positive squares in 5 ways, for example, as 1444 + 66683556 = 38^2 + 8166^2 .

It is a tau number, because it is divible by the number of its divisors (40).

It is an unprimeable number.

It is a polite number, since it can be written in 9 ways as a sum of consecutive naturals, for example, 1669 + ... + 11668.

Almost surely, 2^66685000 is an apocalyptic number.

It is an amenable number.

66685000 is an abundant number, since it is smaller than the sum of its proper divisors (89569670).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

66685000 is a wasteful number, since it uses less digits than its factorization.

66685000 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13363 (or 13344 counting only the distinct ones).

The product of its (nonzero) digits is 8640, while the sum is 31.

The square root of 66685000 is about 8166.0884149022. The cubic root of 66685000 is about 405.5172986438.

The spelling of 66685000 in words is "sixty-six million, six hundred eighty-five thousand".