205128511250843 has 2 divisors, whose sum is σ = 205128511250844. Its totient is φ = 205128511250842.

The previous prime is 205128511250813. The next prime is 205128511250933. The reversal of 205128511250843 is 348052115821502.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 205128511250843 - 2¹⁸ = 205128510988699 is a prime.

It is a super-2 number, since 2×205128511250843² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (205128511250813) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 102564255625421 + 102564255625422.

It is an arithmetic number, because the mean of its divisors is an integer number (102564255625422).

Almost surely, 2^{205128511250843} is an apocalyptic number.

205128511250843 is a deficient number, since it is larger than the sum of its proper divisors (1).

205128511250843 is an equidigital number, since it uses as much as digits as its factorization.

205128511250843 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 768000, while the sum is 47.

The spelling of 205128511250843 in words is "two hundred five trillion, one hundred twenty-eight billion, five hundred eleven million, two hundred fifty thousand, eight hundred forty-three".