6845144121209 has 2 divisors, whose sum is σ = 6845144121210. Its totient is φ = 6845144121208.

The previous prime is 6845144121157. The next prime is 6845144121227. The reversal of 6845144121209 is 9021214415486.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 6776374303609 + 68769817600 = 2603147^2 + 262240^2 .

It is a cyclic number.

It is not a de Polignac number, because 6845144121209 - 2⁸ = 6845144120953 is a prime.

It is not a weakly prime, because it can be changed into another prime (6845144121269) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3422572060604 + 3422572060605.

It is an arithmetic number, because the mean of its divisors is an integer number (3422572060605).

Almost surely, 2^{6845144121209} is an apocalyptic number.

It is an amenable number.

6845144121209 is a deficient number, since it is larger than the sum of its proper divisors (1).

6845144121209 is an equidigital number, since it uses as much as digits as its factorization.

6845144121209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 552960, while the sum is 47.

The spelling of 6845144121209 in words is "six trillion, eight hundred forty-five billion, one hundred forty-four million, one hundred twenty-one thousand, two hundred nine".