64666222193 has 2 divisors, whose sum is σ = 64666222194. Its totient is φ = 64666222192.

The previous prime is 64666222139. The next prime is 64666222207. The reversal of 64666222193 is 39122266646.

It is a happy number.

Together with previous prime (64666222139) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 49565007424 + 15101214769 = 222632^2 + 122887^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-64666222193 is a prime.

It is not a weakly prime, because it can be changed into another prime (64666225193) 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, 32333111096 + 32333111097.

It is an arithmetic number, because the mean of its divisors is an integer number (32333111097).

Almost surely, 2^64666222193 is an apocalyptic number.

It is an amenable number.

64666222193 is a deficient number, since it is larger than the sum of its proper divisors (1).

64666222193 is an equidigital number, since it uses as much as digits as its factorization.

64666222193 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1119744, while the sum is 47.

The spelling of 64666222193 in words is "sixty-four billion, six hundred sixty-six million, two hundred twenty-two thousand, one hundred ninety-three".