266808965 has 8 divisors (see below), whose sum is σ = 339004440. Its totient is φ = 200891392.

The previous prime is 266808929. The next prime is 266808977. The reversal of 266808965 is 569808662.

It can be written as a sum of positive squares in 4 ways, for example, as 6728836 + 260080129 = 2594^2 + 16127^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 266808965 - 2¹⁰ = 266807941 is a prime.

It is a congruent number.

It is an unprimeable number.

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 in 7 ways as a sum of consecutive naturals, for example, 1569380 + ... + 1569549.

It is an arithmetic number, because the mean of its divisors is an integer number (42375555).

Almost surely, 2^266808965 is an apocalyptic number.

It is an amenable number.

266808965 is a deficient number, since it is larger than the sum of its proper divisors (72195475).

266808965 is a wasteful number, since it uses less digits than its factorization.

266808965 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3138951.

The product of its (nonzero) digits is 1244160, while the sum is 50.

The square root of 266808965 is about 16334.2880163171. The cubic root of 266808965 is about 643.7740589871.

The spelling of 266808965 in words is "two hundred sixty-six million, eight hundred eight thousand, nine hundred sixty-five".