266556 has 24 divisors (see below), whose sum is σ = 631120. Its totient is φ = 87552.

The previous prime is 266549. The next prime is 266587. The reversal of 266556 is 655662.

It is a super-2 number, since 2×266556² = 142104202272, which contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 1050 + ... + 1278.

2²⁶⁶⁵⁵⁶ is an apocalyptic number.

It is an amenable number.

266556 is an abundant number, since it is smaller than the sum of its proper divisors (364564).

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

266556 is a wasteful number, since it uses less digits than its factorization.

266556 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 333 (or 331 counting only the distinct ones).

The product of its digits is 10800, while the sum is 30.

The square root of 266556 is about 516.2906158357. The cubic root of 266556 is about 64.3570537841.

The spelling of 266556 in words is "two hundred sixty-six thousand, five hundred fifty-six".