261632255 has 16 divisors (see below), whose sum is σ = 320768640. Its totient is φ = 204799392.

The previous prime is 261632249. The next prime is 261632263. The reversal of 261632255 is 552236162.

It is a cyclic number.

It is not a de Polignac number, because 261632255 - 2⁶ = 261632191 is a prime.

It is a zygodrome in base 2.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 65012 + ... + 68918.

It is an arithmetic number, because the mean of its divisors is an integer number (20048040).

Almost surely, 2^261632255 is an apocalyptic number.

261632255 is a deficient number, since it is larger than the sum of its proper divisors (59136385).

261632255 is a wasteful number, since it uses less digits than its factorization.

261632255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4198.

The product of its digits is 21600, while the sum is 32.

The square root of 261632255 is about 16175.0503863203. The cubic root of 261632255 is about 639.5832695614.

The spelling of 261632255 in words is "two hundred sixty-one million, six hundred thirty-two thousand, two hundred fifty-five".