205454303423 has 16 divisors (see below), whose sum is σ = 218617698816. Its totient is φ = 192649760160.

The previous prime is 205454303401. The next prime is 205454303489. The reversal of 205454303423 is 324303454502.

It is a happy number.

It is a cyclic number.

It is not a de Polignac number, because 205454303423 - 2¹² = 205454299327 is a prime.

It is a super-2 number, since 2×205454303423² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205454303023) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1375958 + ... + 1517948.

It is an arithmetic number, because the mean of its divisors is an integer number (13663606176).

Almost surely, 2^205454303423 is an apocalyptic number.

205454303423 is a gapful number since it is divisible by the number (23) formed by its first and last digit.

205454303423 is a deficient number, since it is larger than the sum of its proper divisors (13163395393).

205454303423 is a wasteful number, since it uses less digits than its factorization.

205454303423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 143254.

The product of its (nonzero) digits is 172800, while the sum is 35.

Adding to 205454303423 its reverse (324303454502), we get a palindrome (529757757925).

The spelling of 205454303423 in words is "two hundred five billion, four hundred fifty-four million, three hundred three thousand, four hundred twenty-three".