268164781 has 2 divisors, whose sum is σ = 268164782. Its totient is φ = 268164780.

The previous prime is 268164779. The next prime is 268164811. The reversal of 268164781 is 187461862.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 175138756 + 93026025 = 13234^2 + 9645^2 .

It is a cyclic number.

It is not a de Polignac number, because 268164781 - 2¹ = 268164779 is a prime.

It is a super-2 number, since 2×268164781² = 143824699537555922, which contains 22 as substring.

Together with 268164779, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (268164731) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134082390 + 134082391.

It is an arithmetic number, because the mean of its divisors is an integer number (134082391).

Almost surely, 2^268164781 is an apocalyptic number.

It is an amenable number.

268164781 is a deficient number, since it is larger than the sum of its proper divisors (1).

268164781 is an equidigital number, since it uses as much as digits as its factorization.

268164781 is an evil number, because the sum of its binary digits is even.

The product of its digits is 129024, while the sum is 43.

The square root of 268164781 is about 16375.7375711752. The cubic root of 268164781 is about 644.8626841471.

The spelling of 268164781 in words is "two hundred sixty-eight million, one hundred sixty-four thousand, seven hundred eighty-one".