266263668 has 72 divisors (see below), whose sum is σ = 743180256. Its totient is φ = 79704000.

The previous prime is 266263667. The next prime is 266263687. The reversal of 266263668 is 866362662.

266263668 is a `hidden beast` number, since 2 + 6 + 6 + 2 + 636 + 6 + 8 = 666.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266263661) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 28818 + ... + 36918.

It is an arithmetic number, because the mean of its divisors is an integer number (10321948).

Almost surely, 2^266263668 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266263668, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (371590128).

266263668 is an abundant number, since it is smaller than the sum of its proper divisors (476916588).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

266263668 is a wasteful number, since it uses less digits than its factorization.

266263668 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8205 (or 8200 counting only the distinct ones).

The product of its digits is 746496, while the sum is 45.

The square root of 266263668 is about 16317.5876893614. The cubic root of 266263668 is about 643.3351838177.

The spelling of 266263668 in words is "two hundred sixty-six million, two hundred sixty-three thousand, six hundred sixty-eight".