66644266243 has 2 divisors, whose sum is σ = 66644266244. Its totient is φ = 66644266242.

The previous prime is 66644266229. The next prime is 66644266327. The reversal of 66644266243 is 34266244666.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66644266243 - 2¹⁷ = 66644135171 is a prime.

It is not a weakly prime, because it can be changed into another prime (66644266223) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33322133121 + 33322133122.

It is an arithmetic number, because the mean of its divisors is an integer number (33322133122).

Almost surely, 2^66644266243 is an apocalyptic number.

66644266243 is a deficient number, since it is larger than the sum of its proper divisors (1).

66644266243 is an equidigital number, since it uses as much as digits as its factorization.

66644266243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5971968, while the sum is 49.

The spelling of 66644266243 in words is "sixty-six billion, six hundred forty-four million, two hundred sixty-six thousand, two hundred forty-three".