266540205 has 16 divisors (see below), whose sum is σ = 427616640. Its totient is φ = 141770688.

The previous prime is 266540191. The next prime is 266540231. The reversal of 266540205 is 502045662.

It is not a de Polignac number, because 266540205 - 2⁵ = 266540173 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 18225 + ... + 29414.

It is an arithmetic number, because the mean of its divisors is an integer number (26726040).

Almost surely, 2^266540205 is an apocalyptic number.

It is an amenable number.

266540205 is a deficient number, since it is larger than the sum of its proper divisors (161076435).

266540205 is a wasteful number, since it uses less digits than its factorization.

266540205 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48020.

The product of its (nonzero) digits is 14400, while the sum is 30.

The square root of 266540205 is about 16326.0590774381. The cubic root of 266540205 is about 643.5578258182.

Adding to 266540205 its reverse (502045662), we get a palindrome (768585867).

The spelling of 266540205 in words is "two hundred sixty-six million, five hundred forty thousand, two hundred five".