266540947 has 2 divisors, whose sum is σ = 266540948. Its totient is φ = 266540946.

The previous prime is 266540929. The next prime is 266540983. The reversal of 266540947 is 749045662.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 266540947 - 2²³ = 258152339 is a prime.

It is not a weakly prime, because it can be changed into another prime (266540917) 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 as a sum of consecutive naturals, namely, 133270473 + 133270474.

It is an arithmetic number, because the mean of its divisors is an integer number (133270474).

Almost surely, 2^266540947 is an apocalyptic number.

266540947 is a deficient number, since it is larger than the sum of its proper divisors (1).

266540947 is an equidigital number, since it uses as much as digits as its factorization.

266540947 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 362880, while the sum is 43.

The square root of 266540947 is about 16326.0818018286. The cubic root of 266540947 is about 643.5584230008.

The spelling of 266540947 in words is "two hundred sixty-six million, five hundred forty thousand, nine hundred forty-seven".