268911661 has 16 divisors (see below), whose sum is σ = 292925808. Its totient is φ = 245862400.

The previous prime is 268911659. The next prime is 268911667. The reversal of 268911661 is 166119862.

It can be written as a sum of positive squares in 8 ways, for example, as 22610025 + 246301636 = 4755^2 + 15694^2 .

It is a cyclic number.

It is not a de Polignac number, because 268911661 - 2¹ = 268911659 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 (268911667) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 195171 + ... + 196543.

It is an arithmetic number, because the mean of its divisors is an integer number (18307863).

Almost surely, 2^268911661 is an apocalyptic number.

It is an amenable number.

268911661 is a deficient number, since it is larger than the sum of its proper divisors (24014147).

268911661 is a wasteful number, since it uses less digits than its factorization.

268911661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712.

The product of its digits is 31104, while the sum is 40.

The square root of 268911661 is about 16398.5261837764. The cubic root of 268911661 is about 645.4608096577.

The spelling of 268911661 in words is "two hundred sixty-eight million, nine hundred eleven thousand, six hundred sixty-one".