266316261 has 16 divisors (see below), whose sum is σ = 358214016. Its totient is φ = 175988736.

The previous prime is 266316247. The next prime is 266316263. The reversal of 266316261 is 162613662.

It is not a de Polignac number, because 266316261 - 2¹⁰ = 266315237 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266316263) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 203736 + ... + 205038.

It is an arithmetic number, because the mean of its divisors is an integer number (22388376).

Almost surely, 2^266316261 is an apocalyptic number.

It is an amenable number.

266316261 is a deficient number, since it is larger than the sum of its proper divisors (91897755).

266316261 is a wasteful number, since it uses less digits than its factorization.

266316261 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1852.

The product of its digits is 15552, while the sum is 33.

The square root of 266316261 is about 16319.1991531447. The cubic root of 266316261 is about 643.3775387011.

The spelling of 266316261 in words is "two hundred sixty-six million, three hundred sixteen thousand, two hundred sixty-one".