66564312 has 32 divisors (see below), whose sum is σ = 166795200. Its totient is φ = 22136864.

The previous prime is 66564307. The next prime is 66564313. The reversal of 66564312 is 21346566.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66564313) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 8239 + ... + 14177.

It is an arithmetic number, because the mean of its divisors is an integer number (5212350).

Almost surely, 2^66564312 is an apocalyptic number.

It is an amenable number.

66564312 is an abundant number, since it is smaller than the sum of its proper divisors (100230888).

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

66564312 is a wasteful number, since it uses less digits than its factorization.

66564312 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6415 (or 6411 counting only the distinct ones).

The product of its digits is 25920, while the sum is 33.

The square root of 66564312 is about 8158.6954839607. The cubic root of 66564312 is about 405.2725128282.

The spelling of 66564312 in words is "sixty-six million, five hundred sixty-four thousand, three hundred twelve".