66067717 has 2 divisors, whose sum is σ = 66067718. Its totient is φ = 66067716.

The previous prime is 66067711. The next prime is 66067721. The reversal of 66067717 is 71776066.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 53670276 + 12397441 = 7326^2 + 3521^2 .

It is a cyclic number.

It is not a de Polignac number, because 66067717 - 2¹⁵ = 66034949 is a prime.

It is a Chen prime.

It is a self number, because there is not a number n which added to its sum of digits gives 66067717.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66067711) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33033858 + 33033859.

It is an arithmetic number, because the mean of its divisors is an integer number (33033859).

Almost surely, 2^66067717 is an apocalyptic number.

It is an amenable number.

66067717 is a deficient number, since it is larger than the sum of its proper divisors (1).

66067717 is an equidigital number, since it uses as much as digits as its factorization.

66067717 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 74088, while the sum is 40.

The square root of 66067717 is about 8128.2050294022. The cubic root of 66067717 is about 404.2621672695.

The spelling of 66067717 in words is "sixty-six million, sixty-seven thousand, seven hundred seventeen".