266489623 has 2 divisors, whose sum is σ = 266489624. Its totient is φ = 266489622.

The previous prime is 266489593. The next prime is 266489669. The reversal of 266489623 is 326984662.

It is an a-pointer prime, because the next prime (266489669) can be obtained adding 266489623 to its sum of digits (46).

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266489623 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266489693) 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, 133244811 + 133244812.

It is an arithmetic number, because the mean of its divisors is an integer number (133244812).

Almost surely, 2^266489623 is an apocalyptic number.

266489623 is a deficient number, since it is larger than the sum of its proper divisors (1).

266489623 is an equidigital number, since it uses as much as digits as its factorization.

266489623 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 746496, while the sum is 46.

The square root of 266489623 is about 16324.5098854453. The cubic root of 266489623 is about 643.5171133844.

The spelling of 266489623 in words is "two hundred sixty-six million, four hundred eighty-nine thousand, six hundred twenty-three".