266266561 has 8 divisors (see below), whose sum is σ = 303102144. Its totient is φ = 231535920.

The previous prime is 266266547. The next prime is 266266601. The reversal of 266266561 is 165662662.

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

It is not a de Polignac number, because 266266561 - 2¹¹ = 266264513 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266266501) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 525966 + ... + 526471.

It is an arithmetic number, because the mean of its divisors is an integer number (37887768).

Almost surely, 2^266266561 is an apocalyptic number.

It is an amenable number.

266266561 is a deficient number, since it is larger than the sum of its proper divisors (36835583).

266266561 is a wasteful number, since it uses less digits than its factorization.

266266561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1052471.

The product of its digits is 155520, while the sum is 40.

The square root of 266266561 is about 16317.6763358022. The cubic root of 266266561 is about 643.3375137913.

The spelling of 266266561 in words is "two hundred sixty-six million, two hundred sixty-six thousand, five hundred sixty-one".