268563661 has 4 divisors (see below), whose sum is σ = 268805212. Its totient is φ = 268322112.

The previous prime is 268563601. The next prime is 268563679. The reversal of 268563661 is 166365862.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 33524100 + 235039561 = 5790^2 + 15331^2 .

It is a cyclic number.

It is not a de Polignac number, because 268563661 - 2¹¹ = 268561613 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 (268563601) 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, 119100 + ... + 121333.

It is an arithmetic number, because the mean of its divisors is an integer number (67201303).

Almost surely, 2^268563661 is an apocalyptic number.

It is an amenable number.

268563661 is a deficient number, since it is larger than the sum of its proper divisors (241551).

268563661 is a wasteful number, since it uses less digits than its factorization.

268563661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 241550.

The product of its digits is 311040, while the sum is 43.

The square root of 268563661 is about 16387.9120390610. The cubic root of 268563661 is about 645.1822580511.

The spelling of 268563661 in words is "two hundred sixty-eight million, five hundred sixty-three thousand, six hundred sixty-one".