266121247 has 16 divisors (see below), whose sum is σ = 336033792. Its totient is φ = 205349760.

The previous prime is 266121221. The next prime is 266121259. The reversal of 266121247 is 742121662.

It is not a de Polignac number, because 266121247 - 2¹⁹ = 265596959 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 (266121047) 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 15 ways as a sum of consecutive naturals, for example, 45879 + ... + 51352.

It is an arithmetic number, because the mean of its divisors is an integer number (21002112).

Almost surely, 2^266121247 is an apocalyptic number.

266121247 is a deficient number, since it is larger than the sum of its proper divisors (69912545).

266121247 is a wasteful number, since it uses less digits than its factorization.

266121247 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 97278.

The product of its digits is 8064, while the sum is 31.

The square root of 266121247 is about 16313.2230720971. The cubic root of 266121247 is about 643.2204594644.

The spelling of 266121247 in words is "two hundred sixty-six million, one hundred twenty-one thousand, two hundred forty-seven".