266556900 has 72 divisors (see below), whose sum is σ = 772901920. Its totient is φ = 70928640.

The previous prime is 266556859. The next prime is 266556911. The reversal of 266556900 is 9655662.

266556900 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a super-2 number, since 2×266556900² = 142105161875220000, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 235536 + ... + 236664.

Almost surely, 2^266556900 is an apocalyptic number.

266556900 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 266556900, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (386450960).

266556900 is an abundant number, since it is smaller than the sum of its proper divisors (506345020).

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

266556900 is a wasteful number, since it uses less digits than its factorization.

266556900 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1933 (or 1926 counting only the distinct ones).

The product of its (nonzero) digits is 97200, while the sum is 39.

The square root of 266556900 is about 16326.5703685740. The cubic root of 266556900 is about 643.5712621572.

The spelling of 266556900 in words is "two hundred sixty-six million, five hundred fifty-six thousand, nine hundred".