266813568 has 256 divisors, whose sum is σ = 925344000. Its totient is φ = 74096640.

The previous prime is 266813563. The next prime is 266813597. The reversal of 266813568 is 865318662.

266813568 is a `hidden beast` number, since 2 + 6 + 6 + 81 + 3 + 568 = 666.

It is a nialpdrome in base 12.

It is not an unprimeable number, because it can be changed into a prime (266813563) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 991738 + ... + 992006.

It is an arithmetic number, because the mean of its divisors is an integer number (3614625).

Almost surely, 2^266813568 is an apocalyptic number.

266813568 is a gapful number since it is divisible by the number (28) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 266813568, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (462672000).

266813568 is an abundant number, since it is smaller than the sum of its proper divisors (658530432).

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

266813568 is a wasteful number, since it uses less digits than its factorization.

266813568 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 340 (or 322 counting only the distinct ones).

The product of its digits is 414720, while the sum is 45.

The square root of 266813568 is about 16334.4289156371. The cubic root of 266813568 is about 643.7777611053. Note that the first 4 decimals are identical.

The spelling of 266813568 in words is "two hundred sixty-six million, eight hundred thirteen thousand, five hundred sixty-eight".