66417361909 has 2 divisors, whose sum is σ = 66417361910. Its totient is φ = 66417361908.

The previous prime is 66417361883. The next prime is 66417361961. The reversal of 66417361909 is 90916371466.

It is an a-pointer prime, because the next prime (66417361961) can be obtained adding 66417361909 to its sum of digits (52).

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 39626874225 + 26790487684 = 199065^2 + 163678^2 .

It is a cyclic number.

It is not a de Polignac number, because 66417361909 - 2¹⁹ = 66416837621 is a prime.

It is a super-2 number, since 2×66417361909² (a number of 22 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (66417461909) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33208680954 + 33208680955.

It is an arithmetic number, because the mean of its divisors is an integer number (33208680955).

Almost surely, 2^66417361909 is an apocalyptic number.

It is an amenable number.

66417361909 is a deficient number, since it is larger than the sum of its proper divisors (1).

66417361909 is an equidigital number, since it uses as much as digits as its factorization.

66417361909 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1469664, while the sum is 52.

The spelling of 66417361909 in words is "sixty-six billion, four hundred seventeen million, three hundred sixty-one thousand, nine hundred nine".