268658163281 has 2 divisors, whose sum is σ = 268658163282. Its totient is φ = 268658163280.

The previous prime is 268658163247. The next prime is 268658163299. The reversal of 268658163281 is 182361856862.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 261836890000 + 6821273281 = 511700^2 + 82591^2 .

It is a cyclic number.

It is not a de Polignac number, because 268658163281 - 2⁶ = 268658163217 is a prime.

It is a super-2 number, since 2×268658163281² (a number of 24 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (268658163211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 134329081640 + 134329081641.

It is an arithmetic number, because the mean of its divisors is an integer number (134329081641).

Almost surely, 2^268658163281 is an apocalyptic number.

It is an amenable number.

268658163281 is a deficient number, since it is larger than the sum of its proper divisors (1).

268658163281 is an equidigital number, since it uses as much as digits as its factorization.

268658163281 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6635520, while the sum is 56.

The spelling of 268658163281 in words is "two hundred sixty-eight billion, six hundred fifty-eight million, one hundred sixty-three thousand, two hundred eighty-one".