209009824345668 has 24 divisors (see below), whose sum is σ = 492005427223968. Its totient is φ = 69053393293696.

The previous prime is 209009824345607. The next prime is 209009824345711. The reversal of 209009824345668 is 866543428900902.

It is a junction number, because it is equal to n+sod(n) for n = 209009824345599 and 209009824345608.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 77068517946 + ... + 77068520657.

It is an arithmetic number, because the mean of its divisors is an integer number (20500226134332).

Almost surely, 2^{209009824345668} is an apocalyptic number.

It is an amenable number.

209009824345668 is an abundant number, since it is smaller than the sum of its proper divisors (282995602878300).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

209009824345668 is a wasteful number, since it uses less digits than its factorization.

209009824345668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 154137038723 (or 154137038721 counting only the distinct ones).

The product of its (nonzero) digits is 179159040, while the sum is 66.

The spelling of 209009824345668 in words is "two hundred nine trillion, nine billion, eight hundred twenty-four million, three hundred forty-five thousand, six hundred sixty-eight".