205104505543 has 16 divisors (see below), whose sum is σ = 241705368576. Its totient is φ = 170408628000.

The previous prime is 205104505517. The next prime is 205104505561. The reversal of 205104505543 is 345505401502.

It is not a de Polignac number, because 205104505543 - 2⁵ = 205104505511 is a prime.

It is a super-3 number, since 3×205104505543³ (a number of 35 digits) contains 333 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 205104505499 and 205104505508.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (205104505043) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3299583 + ... + 3361168.

It is an arithmetic number, because the mean of its divisors is an integer number (15106585536).

Almost surely, 2^205104505543 is an apocalyptic number.

205104505543 is a deficient number, since it is larger than the sum of its proper divisors (36600863033).

205104505543 is an equidigital number, since it uses as much as digits as its factorization.

205104505543 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6660894.

The product of its (nonzero) digits is 60000, while the sum is 34.

The spelling of 205104505543 in words is "two hundred five billion, one hundred four million, five hundred five thousand, five hundred forty-three".