266872257 has 12 divisors (see below), whose sum is σ = 385759764. Its totient is φ = 177786720.

The previous prime is 266872237. The next prime is 266872357. The reversal of 266872257 is 752278662.

266872257 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It can be written as a sum of positive squares in 2 ways, for example, as 99920016 + 166952241 = 9996^2 + 12921^2 .

It is not a de Polignac number, because 266872257 - 2⁷ = 266872129 is a prime.

It is a hoax number, since the sum of its digits (45) coincides with the sum of the digits of its distinct prime factors.

It is not an unprimeable number, because it can be changed into a prime (266872217) by changing a digit.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 3507 + ... + 23367.

It is an arithmetic number, because the mean of its divisors is an integer number (32146647).

Almost surely, 2^266872257 is an apocalyptic number.

It is an amenable number.

266872257 is a deficient number, since it is larger than the sum of its proper divisors (118887507).

266872257 is a wasteful number, since it uses less digits than its factorization.

266872257 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21360 (or 21357 counting only the distinct ones).

The product of its digits is 564480, while the sum is 45.

The square root of 266872257 is about 16336.2252983974. The cubic root of 266872257 is about 643.8249599832.

The spelling of 266872257 in words is "two hundred sixty-six million, eight hundred seventy-two thousand, two hundred fifty-seven".