266656320 has 224 divisors, whose sum is σ = 1075334400. Its totient is φ = 60936192.

The previous prime is 266656307. The next prime is 266656331. The reversal of 266656320 is 23656662.

266656320 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a tau number, because it is divible by the number of its divisors (224).

It is a super-2 number, since 2×266656320² = 142211185991884800, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 58276 + ... + 62684.

It is an arithmetic number, because the mean of its divisors is an integer number (4800600).

Almost surely, 2^266656320 is an apocalyptic number.

266656320 is a gapful number since it is divisible by the number (20) 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 266656320, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (537667200).

266656320 is an abundant number, since it is smaller than the sum of its proper divisors (808678080).

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

266656320 is a wasteful number, since it uses less digits than its factorization.

266656320 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4442 (or 4426 counting only the distinct ones).

The product of its (nonzero) digits is 77760, while the sum is 36.

The square root of 266656320 is about 16329.6148148081. The cubic root of 266656320 is about 643.6512649654.

The spelling of 266656320 in words is "two hundred sixty-six million, six hundred fifty-six thousand, three hundred twenty".