255520225 has 27 divisors (see below), whose sum is σ = 333619923. Its totient is φ = 194121840.

The previous prime is 255520219. The next prime is 255520253. The reversal of 255520225 is 522025552.

The square root of 255520225 is 15985.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 91987281 + 163532944 = 9591^2 + 12788^2 .

It is not a de Polignac number, because 255520225 - 2¹⁵ = 255487457 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 255520193 and 255520202.

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 1838206 + ... + 1838344.

Almost surely, 2^255520225 is an apocalyptic number.

255520225 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

255520225 is the 15985-th square number.

255520225 is the 7993-rd centered octagonal number.

It is an amenable number.

255520225 is a deficient number, since it is larger than the sum of its proper divisors (78099698).

255520225 is an equidigital number, since it uses as much as digits as its factorization.

255520225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 334 (or 167 counting only the distinct ones).

The product of its (nonzero) digits is 10000, while the sum is 28.

The cubic root of 255520225 is about 634.5635084906.

Multiplying 255520225 by its product of nonzero digits (10000), we get a square (2555202250000 = 1598500²).

Adding to 255520225 its reverse (522025552), we get a palindrome (777545777).

The spelling of 255520225 in words is "two hundred fifty-five million, five hundred twenty thousand, two hundred twenty-five".