266540949 has 20 divisors (see below), whose sum is σ = 419124640. Its totient is φ = 168340680.

The previous prime is 266540947. The next prime is 266540983. The reversal of 266540949 is 949045662.

266540949 is a `hidden beast` number, since 2 + 66 + 540 + 9 + 49 = 666.

It is not a de Polignac number, because 266540949 - 2¹ = 266540947 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266540947) by changing a digit.

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 19 ways as a sum of consecutive naturals, for example, 85057 + ... + 88134.

It is an arithmetic number, because the mean of its divisors is an integer number (20956232).

Almost surely, 2^266540949 is an apocalyptic number.

It is an amenable number.

266540949 is a deficient number, since it is larger than the sum of its proper divisors (152583691).

266540949 is a wasteful number, since it uses less digits than its factorization.

266540949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 173222 (or 173213 counting only the distinct ones).

The product of its (nonzero) digits is 466560, while the sum is 45.

The square root of 266540949 is about 16326.0818630803. The cubic root of 266540949 is about 643.5584246104.

The spelling of 266540949 in words is "two hundred sixty-six million, five hundred forty thousand, nine hundred forty-nine".