205440205323254 has 48 divisors (see below), whose sum is σ = 348224906980080. Its totient is φ = 90118019721600.

The previous prime is 205440205323211. The next prime is 205440205323259. The reversal of 205440205323254 is 452323502044502.

It is a super-2 number, since 2×205440205323254² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205440205323259) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 19336709 + ... + 28014080.

It is an arithmetic number, because the mean of its divisors is an integer number (7254685562085).

Almost surely, 2^{205440205323254} is an apocalyptic number.

205440205323254 is a deficient number, since it is larger than the sum of its proper divisors (142784701656826).

205440205323254 is a wasteful number, since it uses less digits than its factorization.

205440205323254 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 47350977 (or 47350916 counting only the distinct ones).

The product of its (nonzero) digits is 1152000, while the sum is 41.

Adding to 205440205323254 its reverse (452323502044502), we get a palindrome (657763707367756).

The spelling of 205440205323254 in words is "two hundred five trillion, four hundred forty billion, two hundred five million, three hundred twenty-three thousand, two hundred fifty-four".