209334830805 has 12 divisors (see below), whose sum is σ = 362847040140. Its totient is φ = 111645243072.

The previous prime is 209334830729. The next prime is 209334830819. The reversal of 209334830805 is 508038433902.

209334830805 is a `hidden beast` number, since 2 + 0 + 9 + 334 + 8 + 308 + 0 + 5 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 164603849796 + 44730981009 = 405714^2 + 211497^2 .

It is not a de Polignac number, because 209334830805 - 2³⁵ = 174975092437 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45), and also a Moran number because the ratio is a prime number: 4651885129 = 209334830805 / (2 + 0 + 9 + 3 + 3 + 4 + 8 + 3 + 0 + 8 + 0 + 5).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 2325942520 + ... + 2325942609.

It is an arithmetic number, because the mean of its divisors is an integer number (30237253345).

Almost surely, 2^209334830805 is an apocalyptic number.

It is an amenable number.

209334830805 is a deficient number, since it is larger than the sum of its proper divisors (153512209335).

209334830805 is a wasteful number, since it uses less digits than its factorization.

209334830805 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4651885140 (or 4651885137 counting only the distinct ones).

The product of its (nonzero) digits is 622080, while the sum is 45.

The spelling of 209334830805 in words is "two hundred nine billion, three hundred thirty-four million, eight hundred thirty thousand, eight hundred five".