66844426163 has 2 divisors, whose sum is σ = 66844426164. Its totient is φ = 66844426162.

The previous prime is 66844426157. The next prime is 66844426193. The reversal of 66844426163 is 36162444866.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66844426163 - 2¹⁰ = 66844425139 is a prime.

It is not a weakly prime, because it can be changed into another prime (66844426153) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33422213081 + 33422213082.

It is an arithmetic number, because the mean of its divisors is an integer number (33422213082).

Almost surely, 2^66844426163 is an apocalyptic number.

66844426163 is a deficient number, since it is larger than the sum of its proper divisors (1).

66844426163 is an equidigital number, since it uses as much as digits as its factorization.

66844426163 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 3981312, while the sum is 50.

The spelling of 66844426163 in words is "sixty-six billion, eight hundred forty-four million, four hundred twenty-six thousand, one hundred sixty-three".