66565896 has 16 divisors (see below), whose sum is σ = 166414800. Its totient is φ = 22188624.

The previous prime is 66565867. The next prime is 66565901. The reversal of 66565896 is 69856566.

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, 1386766 + ... + 1386813.

It is an arithmetic number, because the mean of its divisors is an integer number (10400925).

Almost surely, 2^66565896 is an apocalyptic number.

It is an amenable number.

66565896 is an abundant number, since it is smaller than the sum of its proper divisors (99848904).

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

66565896 is a wasteful number, since it uses less digits than its factorization.

66565896 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2773588 (or 2773584 counting only the distinct ones).

The product of its digits is 2332800, while the sum is 51.

The square root of 66565896 is about 8158.7925577257. The cubic root of 66565896 is about 405.2757274966.

The spelling of 66565896 in words is "sixty-six million, five hundred sixty-five thousand, eight hundred ninety-six".