205353545225 has 6 divisors (see below), whose sum is σ = 254638396110. Its totient is φ = 164282836160.

The previous prime is 205353545171. The next prime is 205353545281. The reversal of 205353545225 is 522545353502.

It can be written as a sum of positive squares in 3 ways, for example, as 4143883129 + 201209662096 = 64373^2 + 448564^2 .

It is not a de Polignac number, because 205353545225 - 2¹⁴ = 205353528841 is a prime.

It is a super-2 number, since 2×205353545225² (a number of 23 digits) contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 4107070880 + ... + 4107070929.

It is an arithmetic number, because the mean of its divisors is an integer number (42439732685).

Almost surely, 2^205353545225 is an apocalyptic number.

205353545225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

205353545225 is a deficient number, since it is larger than the sum of its proper divisors (49284850885).

205353545225 is an equidigital number, since it uses as much as digits as its factorization.

205353545225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8214141819 (or 8214141814 counting only the distinct ones).

The product of its (nonzero) digits is 900000, while the sum is 41.

Adding to 205353545225 its reverse (522545353502), we get a palindrome (727898898727).

The spelling of 205353545225 in words is "two hundred five billion, three hundred fifty-three million, five hundred forty-five thousand, two hundred twenty-five".