266816423 has 2 divisors, whose sum is σ = 266816424. Its totient is φ = 266816422.

The previous prime is 266816383. The next prime is 266816461. The reversal of 266816423 is 324618662.

It is an a-pointer prime, because the next prime (266816461) can be obtained adding 266816423 to its sum of digits (38).

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 266816423 - 2¹⁸ = 266554279 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266816023) 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, 133408211 + 133408212.

It is an arithmetic number, because the mean of its divisors is an integer number (133408212).

Almost surely, 2^266816423 is an apocalyptic number.

266816423 is a deficient number, since it is larger than the sum of its proper divisors (1).

266816423 is an equidigital number, since it uses as much as digits as its factorization.

266816423 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 82944, while the sum is 38.

The square root of 266816423 is about 16334.5163075005. The cubic root of 266816423 is about 643.7800573140.

It can be divided in two parts, 2668 and 16423, that added together give a palindrome (19091).

The spelling of 266816423 in words is "two hundred sixty-six million, eight hundred sixteen thousand, four hundred twenty-three".