266961 has 16 divisors (see below), whose sum is σ = 383616. Its totient is φ = 164736.

The previous prime is 266957. The next prime is 266971. The reversal of 266961 is 169662.

It is not a de Polignac number, because 266961 - 2² = 266957 is a prime.

It is not an unprimeable number, because it can be changed into a prime (266921) 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, 3621 + ... + 3693.

It is an arithmetic number, because the mean of its divisors is an integer number (23976).

2²⁶⁶⁹⁶¹ is an apocalyptic number.

It is an amenable number.

266961 is a deficient number, since it is larger than the sum of its proper divisors (116655).

266961 is a wasteful number, since it uses less digits than its factorization.

266961 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 152.

The product of its digits is 3888, while the sum is 30.

The square root of 266961 is about 516.6826879236. The cubic root of 266961 is about 64.3896315754.

The spelling of 266961 in words is "two hundred sixty-six thousand, nine hundred sixty-one".