266621023 has 2 divisors, whose sum is σ = 266621024. Its totient is φ = 266621022.

The previous prime is 266621021. The next prime is 266621063. The reversal of 266621023 is 320126662.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266621023 - 2¹ = 266621021 is a prime.

Together with 266621021, it forms a pair of twin primes.

It is a junction number, because it is equal to n+sod(n) for n = 266620982 and 266621000.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266621021) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133310511 + 133310512.

It is an arithmetic number, because the mean of its divisors is an integer number (133310512).

Almost surely, 2^266621023 is an apocalyptic number.

266621023 is a deficient number, since it is larger than the sum of its proper divisors (1).

266621023 is an equidigital number, since it uses as much as digits as its factorization.

266621023 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 28.

The square root of 266621023 is about 16328.5340125806. The cubic root of 266621023 is about 643.6228639119.

Adding to 266621023 its reverse (320126662), we get a palindrome (586747685).

The spelling of 266621023 in words is "two hundred sixty-six million, six hundred twenty-one thousand, twenty-three".