66444600269 has 2 divisors, whose sum is σ = 66444600270. Its totient is φ = 66444600268.

The previous prime is 66444600241. The next prime is 66444600289. The reversal of 66444600269 is 96200644466.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 65091316900 + 1353283369 = 255130^2 + 36787^2 .

It is a cyclic number.

It is not a de Polignac number, because 66444600269 - 2³² = 62149632973 is a prime.

It is a super-4 number, since 4×66444600269⁴ (a number of 44 digits) contains 4444 as substring. Note that it is a super-d number also for d = 2.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66444600289) 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, 33222300134 + 33222300135.

It is an arithmetic number, because the mean of its divisors is an integer number (33222300135).

Almost surely, 2^66444600269 is an apocalyptic number.

It is an amenable number.

66444600269 is a deficient number, since it is larger than the sum of its proper divisors (1).

66444600269 is an equidigital number, since it uses as much as digits as its factorization.

66444600269 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1492992, while the sum is 47.

The spelling of 66444600269 in words is "sixty-six billion, four hundred forty-four million, six hundred thousand, two hundred sixty-nine".