66057169 has 2 divisors, whose sum is σ = 66057170. Its totient is φ = 66057168.

The previous prime is 66057149. The next prime is 66057179. The reversal of 66057169 is 96175066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 40806544 + 25250625 = 6388^2 + 5025^2 .

It is a cyclic number.

It is not a de Polignac number, because 66057169 - 2¹⁷ = 65926097 is a prime.

It is a super-2 number, since 2×66057169² = 8727099152589122, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (66057119) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33028584 + 33028585.

It is an arithmetic number, because the mean of its divisors is an integer number (33028585).

Almost surely, 2^66057169 is an apocalyptic number.

It is an amenable number.

66057169 is a deficient number, since it is larger than the sum of its proper divisors (1).

66057169 is an equidigital number, since it uses as much as digits as its factorization.

66057169 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 68040, while the sum is 40.

The square root of 66057169 is about 8127.5561517593. The cubic root of 66057169 is about 404.2406520501.

The spelling of 66057169 in words is "sixty-six million, fifty-seven thousand, one hundred sixty-nine".