253665425 has 24 divisors (see below), whose sum is σ = 340170936. Its totient is φ = 186531840.

The previous prime is 253665421. The next prime is 253665431. The reversal of 253665425 is 524566352.

It can be written as a sum of positive squares in 12 ways, for example, as 10804369 + 242861056 = 3287^2 + 15584^2 .

It is not a de Polignac number, because 253665425 - 2² = 253665421 is a prime.

It is a super-2 number, since 2×253665425² = 128692295680861250, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (253665421) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 82007 + ... + 85043.

It is an arithmetic number, because the mean of its divisors is an integer number (14173789).

Almost surely, 2^253665425 is an apocalyptic number.

253665425 is a gapful number since it is divisible by the number (25) formed by its first and last digit.

It is an amenable number.

253665425 is a deficient number, since it is larger than the sum of its proper divisors (86505511).

253665425 is a wasteful number, since it uses less digits than its factorization.

253665425 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3317 (or 3312 counting only the distinct ones).

The product of its digits is 216000, while the sum is 38.

The square root of 253665425 is about 15926.8774403522. The cubic root of 253665425 is about 633.0243637607.

The spelling of 253665425 in words is "two hundred fifty-three million, six hundred sixty-five thousand, four hundred twenty-five".