266402281 has 2 divisors, whose sum is σ = 266402282. Its totient is φ = 266402280.

The previous prime is 266402273. The next prime is 266402293. The reversal of 266402281 is 182204662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 227527056 + 38875225 = 15084^2 + 6235^2 .

It is a cyclic number.

It is not a de Polignac number, because 266402281 - 2³ = 266402273 is a prime.

It is a super-2 number, since 2×266402281² = 141940350644005922, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (266402231) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133201140 + 133201141.

It is an arithmetic number, because the mean of its divisors is an integer number (133201141).

Almost surely, 2^266402281 is an apocalyptic number.

It is an amenable number.

266402281 is a deficient number, since it is larger than the sum of its proper divisors (1).

266402281 is an equidigital number, since it uses as much as digits as its factorization.

266402281 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 9216, while the sum is 31.

The square root of 266402281 is about 16321.8344863560. The cubic root of 266402281 is about 643.4468014367.

The spelling of 266402281 in words is "two hundred sixty-six million, four hundred two thousand, two hundred eighty-one".