255840025 has 27 divisors (see below), whose sum is σ = 369845469. Its totient is φ = 175049280.

The previous prime is 255839963. The next prime is 255840029. The reversal of 255840025 is 520048552.

The square root of 255840025 is 15995.

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

It can be written as a sum of positive squares in 4 ways, for example, as 17816841 + 238023184 = 4221^2 + 15428^2 .

It is not a de Polignac number, because 255840025 - 2⁷ = 255839897 is a prime.

It is not an unprimeable number, because it can be changed into a prime (255840029) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 559597 + ... + 560053.

Almost surely, 2^255840025 is an apocalyptic number.

255840025 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

255840025 is the 15995-th square number.

255840025 is the 7998-th centered octagonal number.

It is an amenable number.

255840025 is a deficient number, since it is larger than the sum of its proper divisors (114005444).

255840025 is an frugal number, since it uses more digits than its factorization.

255840025 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 938 (or 469 counting only the distinct ones).

The product of its (nonzero) digits is 16000, while the sum is 31.

The cubic root of 255840025 is about 634.8281304756.

Adding to 255840025 its reverse (520048552), we get a palindrome (775888577).

The spelling of 255840025 in words is "two hundred fifty-five million, eight hundred forty thousand, twenty-five".