261223563 has 8 divisors (see below), whose sum is σ = 350957376. Its totient is φ = 172819400.

The previous prime is 261223549. The next prime is 261223579. The reversal of 261223563 is 365322162.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 261223563 - 2⁸ = 261223307 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 261223563.

It is not an unprimeable number, because it can be changed into a prime (261223583) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 331953 + ... + 332738.

It is an arithmetic number, because the mean of its divisors is an integer number (43869672).

Almost surely, 2^261223563 is an apocalyptic number.

261223563 is a deficient number, since it is larger than the sum of its proper divisors (89733813).

261223563 is a wasteful number, since it uses less digits than its factorization.

261223563 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 664825.

The product of its digits is 12960, while the sum is 30.

The square root of 261223563 is about 16162.4120415240. The cubic root of 261223563 is about 639.2500680483.

The spelling of 261223563 in words is "two hundred sixty-one million, two hundred twenty-three thousand, five hundred sixty-three".