268915681 has 2 divisors, whose sum is σ = 268915682. Its totient is φ = 268915680.

The previous prime is 268915663. The next prime is 268915697. The reversal of 268915681 is 186519862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 204032656 + 64883025 = 14284^2 + 8055^2 .

It is a cyclic number.

It is not a de Polignac number, because 268915681 - 2⁵ = 268915649 is a prime.

It is a super-2 number, since 2×268915681² = 144631286975387522, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (268915651) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134457840 + 134457841.

It is an arithmetic number, because the mean of its divisors is an integer number (134457841).

Almost surely, 2^268915681 is an apocalyptic number.

It is an amenable number.

268915681 is a deficient number, since it is larger than the sum of its proper divisors (1).

268915681 is an equidigital number, since it uses as much as digits as its factorization.

268915681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 207360, while the sum is 46.

The square root of 268915681 is about 16398.6487553091. The cubic root of 268915681 is about 645.4640260045.

The spelling of 268915681 in words is "two hundred sixty-eight million, nine hundred fifteen thousand, six hundred eighty-one".