206353775249 has 4 divisors (see below), whose sum is σ = 206892558336. Its totient is φ = 205814992164.

The previous prime is 206353775197. The next prime is 206353775261. The reversal of 206353775249 is 942577353602.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206353775249 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 206353775249.

It is not an unprimeable number, because it can be changed into a prime (206353775449) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 269390969 + ... + 269391734.

It is an arithmetic number, because the mean of its divisors is an integer number (51723139584).

Almost surely, 2^206353775249 is an apocalyptic number.

It is an amenable number.

206353775249 is a deficient number, since it is larger than the sum of its proper divisors (538783087).

206353775249 is an equidigital number, since it uses as much as digits as its factorization.

206353775249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 538783086.

The product of its (nonzero) digits is 9525600, while the sum is 53.

The spelling of 206353775249 in words is "two hundred six billion, three hundred fifty-three million, seven hundred seventy-five thousand, two hundred forty-nine".