66441769 has 2 divisors, whose sum is σ = 66441770. Its totient is φ = 66441768.

The previous prime is 66441743. The next prime is 66441811. The reversal of 66441769 is 96714466.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63920025 + 2521744 = 7995^2 + 1588^2 .

It is a cyclic number.

It is not a de Polignac number, because 66441769 - 2²¹ = 64344617 is a prime.

It is a super-2 number, since 2×66441769² = 8829017335698722, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66441719) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33220884 + 33220885.

It is an arithmetic number, because the mean of its divisors is an integer number (33220885).

Almost surely, 2^66441769 is an apocalyptic number.

It is an amenable number.

66441769 is a deficient number, since it is larger than the sum of its proper divisors (1).

66441769 is an equidigital number, since it uses as much as digits as its factorization.

66441769 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 217728, while the sum is 43.

The square root of 66441769 is about 8151.1820615172. The cubic root of 66441769 is about 405.0236616771.

The spelling of 66441769 in words is "sixty-six million, four hundred forty-one thousand, seven hundred sixty-nine".