209255090255 has 16 divisors (see below), whose sum is σ = 256133750400. Its totient is φ = 164069458080.

The previous prime is 209255090189. The next prime is 209255090311. The reversal of 209255090255 is 552090552902.

It is not a de Polignac number, because 209255090255 - 2²² = 209250895951 is a prime.

It is a congruent number.

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 15 ways as a sum of consecutive naturals, for example, 973865 + ... + 1169154.

It is an arithmetic number, because the mean of its divisors is an integer number (16008359400).

Almost surely, 2^209255090255 is an apocalyptic number.

209255090255 is a deficient number, since it is larger than the sum of its proper divisors (46878660145).

209255090255 is a wasteful number, since it uses less digits than its factorization.

209255090255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2143414.

The product of its (nonzero) digits is 405000, while the sum is 44.

The spelling of 209255090255 in words is "two hundred nine billion, two hundred fifty-five million, ninety thousand, two hundred fifty-five".