205406310323 has 4 divisors (see below), whose sum is σ = 205408472808. Its totient is φ = 205404147840.

The previous prime is 205406310313. The next prime is 205406310359. The reversal of 205406310323 is 323013604502.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 323013604502 = 2 ⋅161506802251.

It is a cyclic number.

It is not a de Polignac number, because 205406310323 - 2⁶ = 205406310259 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (205406310313) 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, 931886 + ... + 1131027.

It is an arithmetic number, because the mean of its divisors is an integer number (51352118202).

Almost surely, 2^205406310323 is an apocalyptic number.

205406310323 is a deficient number, since it is larger than the sum of its proper divisors (2162485).

205406310323 is an equidigital number, since it uses as much as digits as its factorization.

205406310323 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2162484.

The product of its (nonzero) digits is 12960, while the sum is 29.

Adding to 205406310323 its reverse (323013604502), we get a palindrome (528419914825).

The spelling of 205406310323 in words is "two hundred five billion, four hundred six million, three hundred ten thousand, three hundred twenty-three".