73445543209 has 2 divisors, whose sum is σ = 73445543210. Its totient is φ = 73445543208.

The previous prime is 73445543183. The next prime is 73445543221. The reversal of 73445543209 is 90234554437.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 44828745984 + 28616797225 = 211728^2 + 169165^2 .

It is a cyclic number.

It is not a de Polignac number, because 73445543209 - 2⁵ = 73445543177 is a prime.

It is not a weakly prime, because it can be changed into another prime (73445543299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 36722771604 + 36722771605.

It is an arithmetic number, because the mean of its divisors is an integer number (36722771605).

Almost surely, 2^73445543209 is an apocalyptic number.

It is an amenable number.

73445543209 is a deficient number, since it is larger than the sum of its proper divisors (1).

73445543209 is an equidigital number, since it uses as much as digits as its factorization.

73445543209 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1814400, while the sum is 46.

The spelling of 73445543209 in words is "seventy-three billion, four hundred forty-five million, five hundred forty-three thousand, two hundred nine".