205128511250875 has 8 divisors (see below), whose sum is σ = 256000382041248. Its totient is φ = 164102809000600.

The previous prime is 205128511250843. The next prime is 205128511250933. The reversal of 205128511250875 is 578052115821502.

It is not a de Polignac number, because 205128511250875 - 2⁵ = 205128511250843 is a prime.

It is a super-2 number, since 2×205128511250875² (a number of 29 digits) contains 22 as substring.

It is a Duffinian 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 7 ways as a sum of consecutive naturals, for example, 820514044879 + ... + 820514045128.

It is an arithmetic number, because the mean of its divisors is an integer number (32000047755156).

Almost surely, 2^{205128511250875} is an apocalyptic number.

205128511250875 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

205128511250875 is a deficient number, since it is larger than the sum of its proper divisors (50871870790373).

205128511250875 is an equidigital number, since it uses as much as digits as its factorization.

205128511250875 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1641028090022 (or 1641028090012 counting only the distinct ones).

The product of its (nonzero) digits is 2240000, while the sum is 52.

The spelling of 205128511250875 in words is "two hundred five trillion, one hundred twenty-eight billion, five hundred eleven million, two hundred fifty thousand, eight hundred seventy-five".