266405856 has 48 divisors (see below), whose sum is σ = 700213248. Its totient is φ = 88688000.

The previous prime is 266405851. The next prime is 266405863. The reversal of 266405856 is 658504662.

266405856 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 (48).

It is a super-2 number, since 2×266405856² = 141944160222185472, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266405851) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 109291 + ... + 111701.

It is an arithmetic number, because the mean of its divisors is an integer number (14587776).

Almost surely, 2^266405856 is an apocalyptic number.

It is an amenable number.

266405856 is an abundant number, since it is smaller than the sum of its proper divisors (433807392).

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

266405856 is a wasteful number, since it uses less digits than its factorization.

266405856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3575 (or 3567 counting only the distinct ones).

The product of its (nonzero) digits is 345600, while the sum is 42.

The square root of 266405856 is about 16321.9440018645. The cubic root of 266405856 is about 643.4496796803.

The spelling of 266405856 in words is "two hundred sixty-six million, four hundred five thousand, eight hundred fifty-six".