204343402243 has 4 divisors (see below), whose sum is σ = 210935124928. Its totient is φ = 197751679560.

The previous prime is 204343402189. The next prime is 204343402247. The reversal of 204343402243 is 342204343402.

It is a happy number.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 204343402243 - 2¹³ = 204343394051 is a prime.

It is a super-3 number, since 3×204343402243³ (a number of 35 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (31), and also a Moran number because the ratio is a prime number: 6591722653 = 204343402243 / (2 + 0 + 4 + 3 + 4 + 3 + 4 + 0 + 2 + 2 + 4 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (204343402247) 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, 3295861296 + ... + 3295861357.

It is an arithmetic number, because the mean of its divisors is an integer number (52733781232).

Almost surely, 2^204343402243 is an apocalyptic number.

204343402243 is a deficient number, since it is larger than the sum of its proper divisors (6591722685).

204343402243 is an equidigital number, since it uses as much as digits as its factorization.

204343402243 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6591722684.

The product of its (nonzero) digits is 55296, while the sum is 31.

Adding to 204343402243 its reverse (342204343402), we get a palindrome (546547745645).

The spelling of 204343402243 in words is "two hundred four billion, three hundred forty-three million, four hundred two thousand, two hundred forty-three".