266761247 has 4 divisors (see below), whose sum is σ = 269122080. Its totient is φ = 264400416.

The previous prime is 266761219. The next prime is 266761279. The reversal of 266761247 is 742167662.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 266761247 - 2¹⁰ = 266760223 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 (266761217) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1180247 + ... + 1180472.

It is an arithmetic number, because the mean of its divisors is an integer number (67280520).

Almost surely, 2^266761247 is an apocalyptic number.

266761247 is a deficient number, since it is larger than the sum of its proper divisors (2360833).

266761247 is a wasteful number, since it uses less digits than its factorization.

266761247 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2360832.

The product of its digits is 169344, while the sum is 41.

The square root of 266761247 is about 16332.8272812762. The cubic root of 266761247 is about 643.7356776655.

The spelling of 266761247 in words is "two hundred sixty-six million, seven hundred sixty-one thousand, two hundred forty-seven".