209805222026 has 8 divisors (see below), whose sum is σ = 317823752484. Its totient is φ = 103863971200.

The previous prime is 209805221993. The next prime is 209805222037. The reversal of 209805222026 is 620222508902.

It is a happy number.

209805222026 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 458045²+1.

It can be written as a sum of positive squares in 2 ways, for example, as 209805222025 + 1 = 458045^2 + 1^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is an unprimeable number.

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 in 3 ways as a sum of consecutive naturals, for example, 519319655 + ... + 519320058.

Almost surely, 2^209805222026 is an apocalyptic number.

209805222026 is a deficient number, since it is larger than the sum of its proper divisors (108018530458).

209805222026 is a wasteful number, since it uses less digits than its factorization.

209805222026 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1038639816.

The product of its (nonzero) digits is 69120, while the sum is 38.

The spelling of 209805222026 in words is "two hundred nine billion, eight hundred five million, two hundred twenty-two thousand, twenty-six".