66246565169 has 2 divisors, whose sum is σ = 66246565170. Its totient is φ = 66246565168.

The previous prime is 66246565127. The next prime is 66246565183. The reversal of 66246565169 is 96156564266.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64645605025 + 1600960144 = 254255^2 + 40012^2 .

It is a cyclic number.

It is not a de Polignac number, because 66246565169 - 2¹⁶ = 66246499633 is a prime.

It is a super-2 number, since 2×66246565169² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (66246565109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33123282584 + 33123282585.

It is an arithmetic number, because the mean of its divisors is an integer number (33123282585).

Almost surely, 2^66246565169 is an apocalyptic number.

It is an amenable number.

66246565169 is a deficient number, since it is larger than the sum of its proper divisors (1).

66246565169 is an equidigital number, since it uses as much as digits as its factorization.

66246565169 is an evil number, because the sum of its binary digits is even.

The product of its digits is 13996800, while the sum is 56.

The spelling of 66246565169 in words is "sixty-six billion, two hundred forty-six million, five hundred sixty-five thousand, one hundred sixty-nine".