205718384454 has 32 divisors (see below), whose sum is σ = 448856190720. Its totient is φ = 62336671200.

The previous prime is 205718384413. The next prime is 205718384471. The reversal of 205718384454 is 454483817502.

It is a junction number, because it is equal to n+sod(n) for n = 205718384397 and 205718384406.

It is a congruent number.

It is an unprimeable number.

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, 3642967 + ... + 3699005.

It is an arithmetic number, because the mean of its divisors is an integer number (14026755960).

Almost surely, 2^205718384454 is an apocalyptic number.

205718384454 is an abundant number, since it is smaller than the sum of its proper divisors (243137806266).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

205718384454 is a wasteful number, since it uses less digits than its factorization.

205718384454 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 111676.

The product of its (nonzero) digits is 4300800, while the sum is 51.

The spelling of 205718384454 in words is "two hundred five billion, seven hundred eighteen million, three hundred eighty-four thousand, four hundred fifty-four".