261110563 has 12 divisors (see below), whose sum is σ = 307590240. Its totient is φ = 220972752.

The previous prime is 261110543. The next prime is 261110573. The reversal of 261110563 is 365011162.

261110563 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a de Polignac number, because none of the positive numbers 2^k-261110563 is a prime.

It is a super-2 number, since 2×261110563² = 136357452220353938, which contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (261110543) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 29856 + ... + 37597.

It is an arithmetic number, because the mean of its divisors is an integer number (25632520).

Almost surely, 2^261110563 is an apocalyptic number.

261110563 is a deficient number, since it is larger than the sum of its proper divisors (46479677).

261110563 is an equidigital number, since it uses as much as digits as its factorization.

261110563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 67546 (or 67539 counting only the distinct ones).

The product of its (nonzero) digits is 1080, while the sum is 25.

The square root of 261110563 is about 16158.9158980422. The cubic root of 261110563 is about 639.1578792284.

The spelling of 261110563 in words is "two hundred sixty-one million, one hundred ten thousand, five hundred sixty-three".