66644244319 has 2 divisors, whose sum is σ = 66644244320. Its totient is φ = 66644244318.

The previous prime is 66644244239. The next prime is 66644244347. The reversal of 66644244319 is 91344244666.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 66644244319 - 2¹¹ = 66644242271 is a prime.

It is a super-2 number, since 2×66644244319² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66644244019) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33322122159 + 33322122160.

It is an arithmetic number, because the mean of its divisors is an integer number (33322122160).

Almost surely, 2^66644244319 is an apocalyptic number.

66644244319 is a deficient number, since it is larger than the sum of its proper divisors (1).

66644244319 is an equidigital number, since it uses as much as digits as its factorization.

66644244319 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2985984, while the sum is 49.

The spelling of 66644244319 in words is "sixty-six billion, six hundred forty-four million, two hundred forty-four thousand, three hundred nineteen".