205557543 has 6 divisors (see below), whose sum is σ = 296916464. Its totient is φ = 137038356.

The previous prime is 205557529. The next prime is 205557553. The reversal of 205557543 is 345755502.

It is not a de Polignac number, because 205557543 - 2⁵ = 205557511 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205557498 and 205557507.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205557503) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 11419855 + ... + 11419872.

Almost surely, 2^205557543 is an apocalyptic number.

205557543 is a deficient number, since it is larger than the sum of its proper divisors (91358921).

205557543 is a wasteful number, since it uses less digits than its factorization.

205557543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22839733 (or 22839730 counting only the distinct ones).

The product of its (nonzero) digits is 105000, while the sum is 36.

The square root of 205557543 is about 14337.2780889540. The cubic root of 205557543 is about 590.1709195510.

The spelling of 205557543 in words is "two hundred five million, five hundred fifty-seven thousand, five hundred forty-three".