266564256 has 96 divisors (see below), whose sum is σ = 808859520. Its totient is φ = 75288576.

The previous prime is 266564251. The next prime is 266564269. The reversal of 266564256 is 652465662.

It is a tau number, because it is divible by the number of its divisors (96).

It is a Harshad number since it is a multiple of its sum of digits (42).

It is not an unprimeable number, because it can be changed into a prime (266564251) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 57580 + ... + 62036.

It is an arithmetic number, because the mean of its divisors is an integer number (8425620).

Almost surely, 2^266564256 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 266564256, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (404429760).

266564256 is an abundant number, since it is smaller than the sum of its proper divisors (542295264).

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

266564256 is a wasteful number, since it uses less digits than its factorization.

266564256 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4566 (or 4558 counting only the distinct ones).

The product of its digits is 518400, while the sum is 42.

The square root of 266564256 is about 16326.7956439713. The cubic root of 266564256 is about 643.5771821773.

The spelling of 266564256 in words is "two hundred sixty-six million, five hundred sixty-four thousand, two hundred fifty-six".