209966113447 has 2 divisors, whose sum is σ = 209966113448. Its totient is φ = 209966113446.

The previous prime is 209966113421. The next prime is 209966113531. The reversal of 209966113447 is 744311669902.

209966113447 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-209966113447 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 209966113394 and 209966113403.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (209966116447) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 104983056723 + 104983056724.

It is an arithmetic number, because the mean of its divisors is an integer number (104983056724).

Almost surely, 2^209966113447 is an apocalyptic number.

209966113447 is a deficient number, since it is larger than the sum of its proper divisors (1).

209966113447 is an equidigital number, since it uses as much as digits as its factorization.

209966113447 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1959552, while the sum is 52.

The spelling of 209966113447 in words is "two hundred nine billion, nine hundred sixty-six million, one hundred thirteen thousand, four hundred forty-seven".