66560369 has 2 divisors, whose sum is σ = 66560370. Its totient is φ = 66560368.

The previous prime is 66560357. The next prime is 66560407. The reversal of 66560369 is 96306566.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65820769 + 739600 = 8113^2 + 860^2 .

It is a cyclic number.

It is not a de Polignac number, because 66560369 - 2⁴ = 66560353 is a prime.

It is a super-2 number, since 2×66560369² = 8860565442832322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Chen prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66560309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33280184 + 33280185.

It is an arithmetic number, because the mean of its divisors is an integer number (33280185).

Almost surely, 2^66560369 is an apocalyptic number.

It is an amenable number.

66560369 is a deficient number, since it is larger than the sum of its proper divisors (1).

66560369 is an equidigital number, since it uses as much as digits as its factorization.

66560369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 174960, while the sum is 41.

The square root of 66560369 is about 8158.4538363589. The cubic root of 66560369 is about 405.2645104366.

The spelling of 66560369 in words is "sixty-six million, five hundred sixty thousand, three hundred sixty-nine".