266881949 has 4 divisors (see below), whose sum is σ = 278485536. Its totient is φ = 255278364.

The previous prime is 266881943. The next prime is 266881969. The reversal of 266881949 is 949188662.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266881949 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 266881949.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266881943) 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 3 ways as a sum of consecutive naturals, for example, 5801759 + ... + 5801804.

It is an arithmetic number, because the mean of its divisors is an integer number (69621384).

Almost surely, 2^266881949 is an apocalyptic number.

It is an amenable number.

266881949 is a deficient number, since it is larger than the sum of its proper divisors (11603587).

266881949 is a wasteful number, since it uses less digits than its factorization.

266881949 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11603586.

The product of its digits is 1492992, while the sum is 53.

The square root of 266881949 is about 16336.5219370587. The cubic root of 266881949 is about 643.8327538194.

The spelling of 266881949 in words is "two hundred sixty-six million, eight hundred eighty-one thousand, nine hundred forty-nine".