66126917 has 2 divisors, whose sum is σ = 66126918. Its totient is φ = 66126916.

The previous prime is 66126899. The next prime is 66126919. The reversal of 66126917 is 71962166.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 41036836 + 25090081 = 6406^2 + 5009^2 .

It is a cyclic number.

It is not a de Polignac number, because 66126917 - 2¹² = 66122821 is a prime.

Together with 66126919, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66126919) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33063458 + 33063459.

It is an arithmetic number, because the mean of its divisors is an integer number (33063459).

Almost surely, 2^66126917 is an apocalyptic number.

It is an amenable number.

66126917 is a deficient number, since it is larger than the sum of its proper divisors (1).

66126917 is an equidigital number, since it uses as much as digits as its factorization.

66126917 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 27216, while the sum is 38.

The square root of 66126917 is about 8131.8458544171. The cubic root of 66126917 is about 404.3828776394.

The spelling of 66126917 in words is "sixty-six million, one hundred twenty-six thousand, nine hundred seventeen".