209308336845 has 16 divisors (see below), whose sum is σ = 352519304640. Its totient is φ = 105755791104.

The previous prime is 209308336841. The next prime is 209308336873. The reversal of 209308336845 is 548633803902.

It is not a de Polignac number, because 209308336845 - 2² = 209308336841 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (209308336841) 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 in 15 ways as a sum of consecutive naturals, for example, 367207324 + ... + 367207893.

It is an arithmetic number, because the mean of its divisors is an integer number (22032456540).

Almost surely, 2^209308336845 is an apocalyptic number.

It is an amenable number.

209308336845 is a deficient number, since it is larger than the sum of its proper divisors (143210967795).

209308336845 is a wasteful number, since it uses less digits than its factorization.

209308336845 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 734415244.

The product of its (nonzero) digits is 3732480, while the sum is 51.

The spelling of 209308336845 in words is "two hundred nine billion, three hundred eight million, three hundred thirty-six thousand, eight hundred forty-five".