268866761 has 2 divisors, whose sum is σ = 268866762. Its totient is φ = 268866760.

The previous prime is 268866733. The next prime is 268866791. The reversal of 268866761 is 167668862.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 225570361 + 43296400 = 15019^2 + 6580^2 .

It is a cyclic number.

It is not a de Polignac number, because 268866761 - 2¹⁴ = 268850377 is a prime.

It is a super-2 number, since 2×268866761² = 144578670341262242, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (268866791) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134433380 + 134433381.

It is an arithmetic number, because the mean of its divisors is an integer number (134433381).

Almost surely, 2^268866761 is an apocalyptic number.

It is an amenable number.

268866761 is a deficient number, since it is larger than the sum of its proper divisors (1).

268866761 is an equidigital number, since it uses as much as digits as its factorization.

268866761 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1161216, while the sum is 50.

The square root of 268866761 is about 16397.1571011563. The cubic root of 268866761 is about 645.4248836050.

The spelling of 268866761 in words is "two hundred sixty-eight million, eight hundred sixty-six thousand, seven hundred sixty-one".