66122909 has 2 divisors, whose sum is σ = 66122910. Its totient is φ = 66122908.

The previous prime is 66122891. The next prime is 66122933. The reversal of 66122909 is 90922166.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 65966884 + 156025 = 8122^2 + 395^2 .

It is a cyclic number.

It is not a de Polignac number, because 66122909 - 2⁸ = 66122653 is a prime.

It is a super-3 number, since 3×66122909³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66122009) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33061454 + 33061455.

It is an arithmetic number, because the mean of its divisors is an integer number (33061455).

Almost surely, 2^66122909 is an apocalyptic number.

It is an amenable number.

66122909 is a deficient number, since it is larger than the sum of its proper divisors (1).

66122909 is an equidigital number, since it uses as much as digits as its factorization.

66122909 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11664, while the sum is 35.

The square root of 66122909 is about 8131.5994121698. The cubic root of 66122909 is about 404.3747074953.

The spelling of 66122909 in words is "sixty-six million, one hundred twenty-two thousand, nine hundred nine".