66321064 has 8 divisors (see below), whose sum is σ = 124352010. Its totient is φ = 33160528.

The previous prime is 66321049. The next prime is 66321071. The reversal of 66321064 is 46012366.

It can be written as a sum of positive squares in only one way, i.e., 66292164 + 28900 = 8142^2 + 170^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is a hoax number, since the sum of its digits (28) coincides with the sum of the digits of its distinct prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4145059 + ... + 4145074.

Almost surely, 2^66321064 is an apocalyptic number.

It is an amenable number.

66321064 is a deficient number, since it is larger than the sum of its proper divisors (58030946).

66321064 is a wasteful number, since it uses less digits than its factorization.

66321064 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8290139 (or 8290135 counting only the distinct ones).

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 66321064 is about 8143.7745548364. The cubic root of 66321064 is about 404.7782436869.

The spelling of 66321064 in words is "sixty-six million, three hundred twenty-one thousand, sixty-four".