266623489 has 4 divisors (see below), whose sum is σ = 290862000. Its totient is φ = 242384980.

The previous prime is 266623471. The next prime is 266623493. The reversal of 266623489 is 984326662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 266623489 - 2⁹ = 266622977 is a prime.

It is not an unprimeable number, because it can be changed into a prime (266623439) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12119239 + ... + 12119260.

It is an arithmetic number, because the mean of its divisors is an integer number (72715500).

Almost surely, 2^266623489 is an apocalyptic number.

It is an amenable number.

266623489 is a deficient number, since it is larger than the sum of its proper divisors (24238511).

266623489 is a wasteful number, since it uses less digits than its factorization.

266623489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 24238510.

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

The square root of 266623489 is about 16328.6095243900. The cubic root of 266623489 is about 643.6248482129.

The spelling of 266623489 in words is "two hundred sixty-six million, six hundred twenty-three thousand, four hundred eighty-nine".