266878231 has 2 divisors, whose sum is σ = 266878232. Its totient is φ = 266878230.

The previous prime is 266878187. The next prime is 266878273. The reversal of 266878231 is 132878662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 266878231 - 2⁷ = 266878103 is a prime.

It is a super-2 number, since 2×266878231² = 142447980363378722, which contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266878531) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133439115 + 133439116.

It is an arithmetic number, because the mean of its divisors is an integer number (133439116).

Almost surely, 2^266878231 is an apocalyptic number.

266878231 is a deficient number, since it is larger than the sum of its proper divisors (1).

266878231 is an equidigital number, since it uses as much as digits as its factorization.

266878231 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 193536, while the sum is 43.

The square root of 266878231 is about 16336.4081425508. The cubic root of 266878231 is about 643.8297640065.

The spelling of 266878231 in words is "two hundred sixty-six million, eight hundred seventy-eight thousand, two hundred thirty-one".