266631 has 16 divisors (see below), whose sum is σ = 380928. Its totient is φ = 165600.

The previous prime is 266603. The next prime is 266633. The reversal of 266631 is 136662.

266631 = T₆₀ + T₆₁ + ... + T₁₂₁.

It is not a de Polignac number, because 266631 - 2⁵ = 266599 is a prime.

It is a super-2 number, since 2×266631² = 142184180322, which contains 22 as substring.

It is a plaindrome in base 9.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (266633) by changing a digit.

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 15 ways as a sum of consecutive naturals, for example, 4341 + ... + 4401.

It is an arithmetic number, because the mean of its divisors is an integer number (23808).

2²⁶⁶⁶³¹ is an apocalyptic number.

266631 is a deficient number, since it is larger than the sum of its proper divisors (114297).

266631 is a wasteful number, since it uses less digits than its factorization.

266631 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 142.

The product of its digits is 1296, while the sum is 24.

The square root of 266631 is about 516.3632442380. The cubic root of 266631 is about 64.3630891968.

The spelling of 266631 in words is "two hundred sixty-six thousand, six hundred thirty-one".