66164569 has 2 divisors, whose sum is σ = 66164570. Its totient is φ = 66164568.

The previous prime is 66164543. The next prime is 66164591. The reversal of 66164569 is 96546166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 54686025 + 11478544 = 7395^2 + 3388^2 .

It is a cyclic number.

It is not a de Polignac number, because 66164569 - 2¹⁵ = 66131801 is a prime.

It is a super-2 number, since 2×66164569² = 8755500381911522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66164519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33082284 + 33082285.

It is an arithmetic number, because the mean of its divisors is an integer number (33082285).

Almost surely, 2^66164569 is an apocalyptic number.

It is an amenable number.

66164569 is a deficient number, since it is larger than the sum of its proper divisors (1).

66164569 is an equidigital number, since it uses as much as digits as its factorization.

66164569 is an evil number, because the sum of its binary digits is even.

The product of its digits is 233280, while the sum is 43.

The square root of 66164569 is about 8134.1606204943. The cubic root of 66164569 is about 404.4596135885.

The spelling of 66164569 in words is "sixty-six million, one hundred sixty-four thousand, five hundred sixty-nine".