66266917 has 2 divisors, whose sum is σ = 66266918. Its totient is φ = 66266916.

The previous prime is 66266909. The next prime is 66266939. The reversal of 66266917 is 71966266.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63218401 + 3048516 = 7951^2 + 1746^2 .

It is a cyclic number.

It is not a de Polignac number, because 66266917 - 2³ = 66266909 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66266957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33133458 + 33133459.

It is an arithmetic number, because the mean of its divisors is an integer number (33133459).

Almost surely, 2^66266917 is an apocalyptic number.

It is an amenable number.

66266917 is a deficient number, since it is larger than the sum of its proper divisors (1).

66266917 is an equidigital number, since it uses as much as digits as its factorization.

66266917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 163296, while the sum is 43.

The square root of 66266917 is about 8140.4494347671. The cubic root of 66266917 is about 404.6680549891.

The spelling of 66266917 in words is "sixty-six million, two hundred sixty-six thousand, nine hundred seventeen".