66166116859 has 2 divisors, whose sum is σ = 66166116860. Its totient is φ = 66166116858.

The previous prime is 66166116827. The next prime is 66166116911. The reversal of 66166116859 is 95861166166.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 66166116859 - 2⁵ = 66166116827 is a prime.

It is a super-3 number, since 3×66166116859³ (a number of 33 digits) contains 333 as substring.

It is not a weakly prime, because it can be changed into another prime (66166113859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33083058429 + 33083058430.

It is an arithmetic number, because the mean of its divisors is an integer number (33083058430).

Almost surely, 2^66166116859 is an apocalyptic number.

66166116859 is a deficient number, since it is larger than the sum of its proper divisors (1).

66166116859 is an equidigital number, since it uses as much as digits as its factorization.

66166116859 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2799360, while the sum is 55.

The spelling of 66166116859 in words is "sixty-six billion, one hundred sixty-six million, one hundred sixteen thousand, eight hundred fifty-nine".