209795485806 has 80 divisors (see below), whose sum is σ = 495003759360. Its totient is φ = 66229183440.

The previous prime is 209795485789. The next prime is 209795485847. The reversal of 209795485806 is 608584597902.

209795485806 is a `hidden beast` number, since 2 + 0 + 9 + 7 + 9 + 5 + 48 + 580 + 6 = 666.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 39 ways as a sum of consecutive naturals, for example, 10981995 + ... + 11001081.

It is an arithmetic number, because the mean of its divisors is an integer number (6187546992).

Almost surely, 2^209795485806 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 209795485806, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (247501879680).

209795485806 is an abundant number, since it is smaller than the sum of its proper divisors (285208273554).

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

209795485806 is a wasteful number, since it uses less digits than its factorization.

209795485806 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22691 (or 22682 counting only the distinct ones).

The product of its (nonzero) digits is 43545600, while the sum is 63.

The spelling of 209795485806 in words is "two hundred nine billion, seven hundred ninety-five million, four hundred eighty-five thousand, eight hundred six".