66814495249 has 2 divisors, whose sum is σ = 66814495250. Its totient is φ = 66814495248.

The previous prime is 66814495217. The next prime is 66814495261. The reversal of 66814495249 is 94259441866.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 64849169025 + 1965326224 = 254655^2 + 44332^2 .

It is a cyclic number.

It is not a de Polignac number, because 66814495249 - 2⁵ = 66814495217 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 66814495193 and 66814495202.

It is not a weakly prime, because it can be changed into another prime (66814495949) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 33407247624 + 33407247625.

It is an arithmetic number, because the mean of its divisors is an integer number (33407247625).

Almost surely, 2^66814495249 is an apocalyptic number.

It is an amenable number.

66814495249 is a deficient number, since it is larger than the sum of its proper divisors (1).

66814495249 is an equidigital number, since it uses as much as digits as its factorization.

66814495249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 14929920, while the sum is 58.

The spelling of 66814495249 in words is "sixty-six billion, eight hundred fourteen million, four hundred ninety-five thousand, two hundred forty-nine".