205497209123 has 8 divisors (see below), whose sum is σ = 206506294992. Its totient is φ = 204489034336.

The previous prime is 205497209107. The next prime is 205497209131. The reversal of 205497209123 is 321902794502.

205497209123 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a Cunningham number, because it is equal to 453318²-1.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 205497209123 - 2⁴ = 205497209107 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205497229123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 226661 + ... + 679977.

It is an arithmetic number, because the mean of its divisors is an integer number (25813286874).

Almost surely, 2^205497209123 is an apocalyptic number.

205497209123 is a deficient number, since it is larger than the sum of its proper divisors (1009085869).

205497209123 is a wasteful number, since it uses less digits than its factorization.

205497209123 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 455541.

The product of its (nonzero) digits is 272160, while the sum is 44.

The spelling of 205497209123 in words is "two hundred five billion, four hundred ninety-seven million, two hundred nine thousand, one hundred twenty-three".