266001 has 4 divisors (see below), whose sum is σ = 354672. Its totient is φ = 177332.

The previous prime is 265987. The next prime is 266003. The reversal of 266001 is 100662.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 266001 - 2⁷ = 265873 is a prime.

It is a D-number.

It is not an unprimeable number, because it can be changed into a prime (266003) 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 3 ways as a sum of consecutive naturals, for example, 44331 + ... + 44336.

It is an arithmetic number, because the mean of its divisors is an integer number (88668).

2²⁶⁶⁰⁰¹ is an apocalyptic number.

It is an amenable number.

266001 is a deficient number, since it is larger than the sum of its proper divisors (88671).

266001 is an equidigital number, since it uses as much as digits as its factorization.

266001 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 88670.

The product of its (nonzero) digits is 72, while the sum is 15.

The square root of 266001 is about 515.7528477866. The cubic root of 266001 is about 64.3123565055.

Adding to 266001 its reverse (100662), we get a palindrome (366663).

The spelling of 266001 in words is "two hundred sixty-six thousand, one".