205521324425 has 6 divisors (see below), whose sum is σ = 254846442318. Its totient is φ = 164417059520.

The previous prime is 205521324401. The next prime is 205521324451. The reversal of 205521324425 is 524423125502.

It is a happy number.

It can be written as a sum of positive squares in 3 ways, for example, as 22638512521 + 182882811904 = 150461^2 + 427648^2 .

It is not a de Polignac number, because 205521324425 - 2²⁸ = 205252888969 is a prime.

It is a super-2 number, since 2×205521324425² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4110426464 + ... + 4110426513.

It is an arithmetic number, because the mean of its divisors is an integer number (42474407053).

Almost surely, 2^205521324425 is an apocalyptic number.

205521324425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

205521324425 is a deficient number, since it is larger than the sum of its proper divisors (49325117893).

205521324425 is an equidigital number, since it uses as much as digits as its factorization.

205521324425 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 8220852987 (or 8220852982 counting only the distinct ones).

The product of its (nonzero) digits is 96000, while the sum is 35.

Adding to 205521324425 its reverse (524423125502), we get a palindrome (729944449927).

The spelling of 205521324425 in words is "two hundred five billion, five hundred twenty-one million, three hundred twenty-four thousand, four hundred twenty-five".