205421053252325 has 6 divisors (see below), whose sum is σ = 254722106032914. Its totient is φ = 164336842601840.

The previous prime is 205421053252313. The next prime is 205421053252333. The reversal of 205421053252325 is 523252350124502.

It can be written as a sum of positive squares in 3 ways, for example, as 67674940284484 + 137746112967841 = 8226478^2 + 11736529^2 .

It is not a de Polignac number, because 205421053252325 - 2²⁰ = 205421052203749 is a prime.

It is a Duffinian number.

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 5 ways as a sum of consecutive naturals, for example, 4108421065022 + ... + 4108421065071.

It is an arithmetic number, because the mean of its divisors is an integer number (42453684338819).

Almost surely, 2^{205421053252325} is an apocalyptic number.

205421053252325 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

205421053252325 is a deficient number, since it is larger than the sum of its proper divisors (49301052780589).

205421053252325 is an equidigital number, since it uses as much as digits as its factorization.

205421053252325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8216842130103 (or 8216842130098 counting only the distinct ones).

The product of its (nonzero) digits is 720000, while the sum is 41.

The spelling of 205421053252325 in words is "two hundred five trillion, four hundred twenty-one billion, fifty-three million, two hundred fifty-two thousand, three hundred twenty-five".