66338856 has 24 divisors (see below), whose sum is σ = 179667930. Its totient is φ = 22112928.

The previous prime is 66338843. The next prime is 66338917. The reversal of 66338856 is 65883366.

66338856 is a `hidden beast` number, since 6 + 633 + 8 + 8 + 5 + 6 = 666.

It can be written as a sum of positive squares in only one way, i.e., 50893956 + 15444900 = 7134^2 + 3930^2 .

It is a tau number, because it is divible by the number of its divisors (24).

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 460615 + ... + 460758.

Almost surely, 2^66338856 is an apocalyptic number.

It is an amenable number.

66338856 is an abundant number, since it is smaller than the sum of its proper divisors (113329074).

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

66338856 is a wasteful number, since it uses less digits than its factorization.

66338856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 921385 (or 921378 counting only the distinct ones).

The product of its digits is 622080, while the sum is 45.

The square root of 66338856 is about 8144.8668497404. The cubic root of 66338856 is about 404.8144371683.

The spelling of 66338856 in words is "sixty-six million, three hundred thirty-eight thousand, eight hundred fifty-six".