205103520225 has 60 divisors (see below), whose sum is σ = 385273912320. Its totient is φ = 107847784800.

The previous prime is 205103520187. The next prime is 205103520229. The reversal of 205103520225 is 522025301502.

It is not a de Polignac number, because 205103520225 - 2⁸ = 205103519969 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (27).

It is not an unprimeable number, because it can be changed into a prime (205103520229) by changing a digit.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 569505 + ... + 857054.

It is an arithmetic number, because the mean of its divisors is an integer number (6421231872).

Almost surely, 2^205103520225 is an apocalyptic number.

205103520225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

205103520225 is a deficient number, since it is larger than the sum of its proper divisors (180170392095).

205103520225 is a wasteful number, since it uses less digits than its factorization.

205103520225 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1426652 (or 1426638 counting only the distinct ones).

The product of its (nonzero) digits is 6000, while the sum is 27.

Adding to 205103520225 its reverse (522025301502), we get a palindrome (727128821727).

The spelling of 205103520225 in words is "two hundred five billion, one hundred three million, five hundred twenty thousand, two hundred twenty-five".