263055561 has 16 divisors (see below), whose sum is σ = 356544384. Its totient is φ = 172491264.

The previous prime is 263055539. The next prime is 263055563. The reversal of 263055561 is 165550362.

It is not a de Polignac number, because 263055561 - 2⁹ = 263055049 is a prime.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (263055563) by changing a digit.

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, 45891 + ... + 51303.

It is an arithmetic number, because the mean of its divisors is an integer number (22284024).

Almost surely, 2^263055561 is an apocalyptic number.

It is an amenable number.

263055561 is a deficient number, since it is larger than the sum of its proper divisors (93488823).

263055561 is a wasteful number, since it uses less digits than its factorization.

263055561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5680.

The product of its (nonzero) digits is 27000, while the sum is 33.

The square root of 263055561 is about 16218.9876687788. The cubic root of 263055561 is about 640.7409720355.

The spelling of 263055561 in words is "two hundred sixty-three million, fifty-five thousand, five hundred sixty-one".