66143117 has 2 divisors, whose sum is σ = 66143118. Its totient is φ = 66143116.

The previous prime is 66143111. The next prime is 66143177. The reversal of 66143117 is 71134166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 59923081 + 6220036 = 7741^2 + 2494^2 .

It is a cyclic number.

It is not a de Polignac number, because 66143117 - 2²² = 61948813 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66143117.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66143111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33071558 + 33071559.

It is an arithmetic number, because the mean of its divisors is an integer number (33071559).

Almost surely, 2^66143117 is an apocalyptic number.

It is an amenable number.

66143117 is a deficient number, since it is larger than the sum of its proper divisors (1).

66143117 is an equidigital number, since it uses as much as digits as its factorization.

66143117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3024, while the sum is 29.

The square root of 66143117 is about 8132.8418772284. The cubic root of 66143117 is about 404.4158973134.

The spelling of 66143117 in words is "sixty-six million, one hundred forty-three thousand, one hundred seventeen".