266553263 has 2 divisors, whose sum is σ = 266553264. Its totient is φ = 266553262.

The previous prime is 266553253. The next prime is 266553277. The reversal of 266553263 is 362355662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266553263 - 2⁴ = 266553247 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266553253) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133276631 + 133276632.

It is an arithmetic number, because the mean of its divisors is an integer number (133276632).

Almost surely, 2^266553263 is an apocalyptic number.

266553263 is a deficient number, since it is larger than the sum of its proper divisors (1).

266553263 is an equidigital number, since it uses as much as digits as its factorization.

266553263 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 194400, while the sum is 38.

The square root of 266553263 is about 16326.4589853403. The cubic root of 266553263 is about 643.5683351031.

The spelling of 266553263 in words is "two hundred sixty-six million, five hundred fifty-three thousand, two hundred sixty-three".