66306397 has 2 divisors, whose sum is σ = 66306398. Its totient is φ = 66306396.

The previous prime is 66306377. The next prime is 66306421. The reversal of 66306397 is 79360366.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 41912676 + 24393721 = 6474^2 + 4939^2 .

It is a cyclic number.

It is not a de Polignac number, because 66306397 - 2⁷ = 66306269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66306337) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33153198 + 33153199.

It is an arithmetic number, because the mean of its divisors is an integer number (33153199).

Almost surely, 2^66306397 is an apocalyptic number.

It is an amenable number.

66306397 is a deficient number, since it is larger than the sum of its proper divisors (1).

66306397 is an equidigital number, since it uses as much as digits as its factorization.

66306397 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 122472, while the sum is 40.

The square root of 66306397 is about 8142.8740012357. The cubic root of 66306397 is about 404.7484023874.

It can be divided in two parts, 66 and 306397, that multiplied together give a palindrome (20222202).

The spelling of 66306397 in words is "sixty-six million, three hundred six thousand, three hundred ninety-seven".