66085834169 has 2 divisors, whose sum is σ = 66085834170. Its totient is φ = 66085834168.

The previous prime is 66085834163. The next prime is 66085834247. The reversal of 66085834169 is 96143858066.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62994474169 + 3091360000 = 250987^2 + 55600^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-66085834169 is a prime.

It is a super-2 number, since 2×66085834169² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66085834163) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33042917084 + 33042917085.

It is an arithmetic number, because the mean of its divisors is an integer number (33042917085).

Almost surely, 2^66085834169 is an apocalyptic number.

It is an amenable number.

66085834169 is a deficient number, since it is larger than the sum of its proper divisors (1).

66085834169 is an equidigital number, since it uses as much as digits as its factorization.

66085834169 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 7464960, while the sum is 56.

The spelling of 66085834169 in words is "sixty-six billion, eighty-five million, eight hundred thirty-four thousand, one hundred sixty-nine".