66208117 has 2 divisors, whose sum is σ = 66208118. Its totient is φ = 66208116.

The previous prime is 66208111. The next prime is 66208123. The reversal of 66208117 is 71180266.

It is a balanced prime because it is at equal distance from previous prime (66208111) and next prime (66208123).

It can be written as a sum of positive squares in only one way, i.e., 35892081 + 30316036 = 5991^2 + 5506^2 .

It is a cyclic number.

It is not a de Polignac number, because 66208117 - 2¹¹ = 66206069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66208111) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33104058 + 33104059.

It is an arithmetic number, because the mean of its divisors is an integer number (33104059).

Almost surely, 2^66208117 is an apocalyptic number.

It is an amenable number.

66208117 is a deficient number, since it is larger than the sum of its proper divisors (1).

66208117 is an equidigital number, since it uses as much as digits as its factorization.

66208117 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 4032, while the sum is 31.

The square root of 66208117 is about 8136.8370390466. The cubic root of 66208117 is about 404.5483294712.

The spelling of 66208117 in words is "sixty-six million, two hundred eight thousand, one hundred seventeen".