261662263 has 4 divisors (see below), whose sum is σ = 261695160. Its totient is φ = 261629368.

The previous prime is 261662257. The next prime is 261662279. The reversal of 261662263 is 362266162.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length.

It is a cyclic number.

It is not a de Polignac number, because 261662263 - 2¹⁷ = 261531191 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (261662363) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3756 + ... + 23182.

It is an arithmetic number, because the mean of its divisors is an integer number (65423790).

Almost surely, 2^261662263 is an apocalyptic number.

261662263 is a deficient number, since it is larger than the sum of its proper divisors (32897).

261662263 is a wasteful number, since it uses less digits than its factorization.

261662263 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 32896.

The product of its digits is 31104, while the sum is 34.

The square root of 261662263 is about 16175.9779611620. The cubic root of 261662263 is about 639.6077210331.

The spelling of 261662263 in words is "two hundred sixty-one million, six hundred sixty-two thousand, two hundred sixty-three".