66321373 has 2 divisors, whose sum is σ = 66321374. Its totient is φ = 66321372.

The previous prime is 66321331. The next prime is 66321379. The reversal of 66321373 is 37312366.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39664804 + 26656569 = 6298^2 + 5163^2 .

It is a cyclic number.

It is not a de Polignac number, because 66321373 - 2²¹ = 64224221 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66321379) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33160686 + 33160687.

It is an arithmetic number, because the mean of its divisors is an integer number (33160687).

Almost surely, 2^66321373 is an apocalyptic number.

It is an amenable number.

66321373 is a deficient number, since it is larger than the sum of its proper divisors (1).

66321373 is an equidigital number, since it uses as much as digits as its factorization.

66321373 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 13608, while the sum is 31.

The square root of 66321373 is about 8143.7935263610. The cubic root of 66321373 is about 404.7788723272.

The spelling of 66321373 in words is "sixty-six million, three hundred twenty-one thousand, three hundred seventy-three".