266660255 has 4 divisors (see below), whose sum is σ = 319992312. Its totient is φ = 213328200.

The previous prime is 266660197. The next prime is 266660263. The reversal of 266660255 is 552066662.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 266660255 - 2²⁰ = 265611679 is a prime.

It is a super-2 number, since 2×266660255² = 142215383193330050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 26666021 + ... + 26666030.

It is an arithmetic number, because the mean of its divisors is an integer number (79998078).

Almost surely, 2^266660255 is an apocalyptic number.

266660255 is a deficient number, since it is larger than the sum of its proper divisors (53332057).

266660255 is an equidigital number, since it uses as much as digits as its factorization.

266660255 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 53332056.

The product of its (nonzero) digits is 129600, while the sum is 38.

The square root of 266660255 is about 16329.7353009778. The cubic root of 266660255 is about 643.6544310323.

The spelling of 266660255 in words is "two hundred sixty-six million, six hundred sixty thousand, two hundred fifty-five".