266665001 has 2 divisors, whose sum is σ = 266665002. Its totient is φ = 266665000.

The previous prime is 266664991. The next prime is 266665027. The reversal of 266665001 is 100566662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 190992400 + 75672601 = 13820^2 + 8699^2 .

It is a cyclic number.

It is not a de Polignac number, because 266665001 - 2¹⁴ = 266648617 is a prime.

It is a super-2 number, since 2×266665001² = 142220445516660002, which contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (266665051) by changing a digit.

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 as a sum of consecutive naturals, namely, 133332500 + 133332501.

It is an arithmetic number, because the mean of its divisors is an integer number (133332501).

Almost surely, 2^266665001 is an apocalyptic number.

It is an amenable number.

266665001 is a deficient number, since it is larger than the sum of its proper divisors (1).

266665001 is an equidigital number, since it uses as much as digits as its factorization.

266665001 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12960, while the sum is 32.

The square root of 266665001 is about 16329.8806180572. The cubic root of 266665001 is about 643.6582495814.

The spelling of 266665001 in words is "two hundred sixty-six million, six hundred sixty-five thousand, one".