66590569 has 2 divisors, whose sum is σ = 66590570. Its totient is φ = 66590568.

The previous prime is 66590507. The next prime is 66590599. The reversal of 66590569 is 96509566.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 50694400 + 15896169 = 7120^2 + 3987^2 .

It is a cyclic number.

It is not a de Polignac number, because 66590569 - 2⁷ = 66590441 is a prime.

It is a super-2 number, since 2×66590569² = 8868607759487522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66590599) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33295284 + 33295285.

It is an arithmetic number, because the mean of its divisors is an integer number (33295285).

Almost surely, 2^66590569 is an apocalyptic number.

It is an amenable number.

66590569 is a deficient number, since it is larger than the sum of its proper divisors (1).

66590569 is an equidigital number, since it uses as much as digits as its factorization.

66590569 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 437400, while the sum is 46.

The square root of 66590569 is about 8160.3044673590. The cubic root of 66590569 is about 405.3257938390.

The spelling of 66590569 in words is "sixty-six million, five hundred ninety thousand, five hundred sixty-nine".