266536243 has 2 divisors, whose sum is σ = 266536244. Its totient is φ = 266536242.

The previous prime is 266536241. The next prime is 266536247. The reversal of 266536243 is 342635662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266536243 - 2¹ = 266536241 is a prime.

Together with 266536241, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (266536241) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133268121 + 133268122.

It is an arithmetic number, because the mean of its divisors is an integer number (133268122).

Almost surely, 2^266536243 is an apocalyptic number.

266536243 is a deficient number, since it is larger than the sum of its proper divisors (1).

266536243 is an equidigital number, since it uses as much as digits as its factorization.

266536243 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520, while the sum is 37.

The square root of 266536243 is about 16325.9377372327. The cubic root of 266536243 is about 643.5546370701.

It can be divided in two parts, 26653 and 6243, that added together give a triangular number (32896 = T₂₅₆).

The spelling of 266536243 in words is "two hundred sixty-six million, five hundred thirty-six thousand, two hundred forty-three".