66569 has 2 divisors, whose sum is σ = 66570. Its totient is φ = 66568.

The previous prime is 66553. The next prime is 66571. The reversal of 66569 is 96566.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40000 + 26569 = 200^2 + 163^2 .

It is a cyclic number.

It is not a de Polignac number, because 66569 - 2⁴ = 66553 is a prime.

It is a super-2 number, since 2×66569² = 8862863522, which contains 22 as substring.

Together with 66571, it forms a pair of twin primes.

It is a Chen prime.

It is a plaindrome in base 15.

It is not a weakly prime, because it can be changed into another prime (66509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33284 + 33285.

It is an arithmetic number, because the mean of its divisors is an integer number (33285).

2⁶⁶⁵⁶⁹ is an apocalyptic number.

It is an amenable number.

66569 is a deficient number, since it is larger than the sum of its proper divisors (1).

66569 is an equidigital number, since it uses as much as digits as its factorization.

66569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 9720, while the sum is 32.

The square root of 66569 is about 258.0096897405. The cubic root of 66569 is about 40.5282026800.

The spelling of 66569 in words is "sixty-six thousand, five hundred sixty-nine".