66044369 has 2 divisors, whose sum is σ = 66044370. Its totient is φ = 66044368.

The previous prime is 66044357. The next prime is 66044387. The reversal of 66044369 is 96344066.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 64320400 + 1723969 = 8020^2 + 1313^2 .

It is a cyclic number.

It is not a de Polignac number, because 66044369 - 2⁸ = 66044113 is a prime.

It is a super-2 number, since 2×66044369² = 8723717353216322, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (66044309) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33022184 + 33022185.

It is an arithmetic number, because the mean of its divisors is an integer number (33022185).

Almost surely, 2^66044369 is an apocalyptic number.

It is an amenable number.

66044369 is a deficient number, since it is larger than the sum of its proper divisors (1).

66044369 is an equidigital number, since it uses as much as digits as its factorization.

66044369 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 93312, while the sum is 38.

The square root of 66044369 is about 8126.7686690345. The cubic root of 66044369 is about 404.2145402509.

The spelling of 66044369 in words is "sixty-six million, forty-four thousand, three hundred sixty-nine".