266568489 has 20 divisors (see below), whose sum is σ = 434409360. Its totient is φ = 161556120.

The previous prime is 266568451. The next prime is 266568521. The reversal of 266568489 is 984865662.

It is a happy number.

It is not a de Polignac number, because 266568489 - 2¹² = 266564393 is a prime.

It is not an unprimeable number, because it can be changed into a prime (266568409) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 148699 + ... + 150480.

It is an arithmetic number, because the mean of its divisors is an integer number (21720468).

Almost surely, 2^266568489 is an apocalyptic number.

It is an amenable number.

266568489 is a deficient number, since it is larger than the sum of its proper divisors (167840871).

266568489 is a wasteful number, since it uses less digits than its factorization.

266568489 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 299202 (or 299193 counting only the distinct ones).

The product of its digits is 4976640, while the sum is 54.

The square root of 266568489 is about 16326.9252769773. The cubic root of 266568489 is about 643.5805887953.

It can be divided in two parts, 2 and 66568489, that added together give a triangular number (66568491 = T₁₁₅₃₈).

The spelling of 266568489 in words is "two hundred sixty-six million, five hundred sixty-eight thousand, four hundred eighty-nine".