205203155225 has 12 divisors (see below), whose sum is σ = 254501034924. Its totient is φ = 164130832320.

The previous prime is 205203155191. The next prime is 205203155281. The reversal of 205203155225 is 522551302502.

It can be written as a sum of positive squares in 6 ways, for example, as 35498704921 + 169704450304 = 188411^2 + 411952^2 .

It is not a de Polignac number, because 205203155225 - 2¹⁰ = 205203154201 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 205203155191 and 205203155200.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 659774 + ... + 919623.

It is an arithmetic number, because the mean of its divisors is an integer number (21208419577).

Almost surely, 2^205203155225 is an apocalyptic number.

205203155225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

205203155225 is a deficient number, since it is larger than the sum of its proper divisors (49297879699).

205203155225 is a wasteful number, since it uses less digits than its factorization.

205203155225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1584604 (or 1584599 counting only the distinct ones).

The product of its (nonzero) digits is 30000, while the sum is 32.

Adding to 205203155225 its reverse (522551302502), we get a palindrome (727754457727).

The spelling of 205203155225 in words is "two hundred five billion, two hundred three million, one hundred fifty-five thousand, two hundred twenty-five".