266666262252041 has 4 divisors (see below), whose sum is σ = 267657586647300. Its totient is φ = 265674937856784.

The previous prime is 266666262252029. The next prime is 266666262252077. The reversal of 266666262252041 is 140252262666662.

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

It can be written as a sum of positive squares in 2 ways, for example, as 11841582145600 + 254824680106441 = 3441160^2 + 15963229^2 .

It is a cyclic number.

It is not a de Polignac number, because 266666262252041 - 2¹⁰ = 266666262251017 is a prime.

It is a super-2 number, since 2×266666262252041² (a number of 30 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (266666262252641) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 495662197226 + ... + 495662197763.

It is an arithmetic number, because the mean of its divisors is an integer number (66914396661825).

Almost surely, 2^{266666262252041} is an apocalyptic number.

It is an amenable number.

266666262252041 is a deficient number, since it is larger than the sum of its proper divisors (991324395259).

266666262252041 is an equidigital number, since it uses as much as digits as its factorization.

266666262252041 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 991324395258.

The product of its (nonzero) digits is 29859840, while the sum is 56.

The spelling of 266666262252041 in words is "two hundred sixty-six trillion, six hundred sixty-six billion, two hundred sixty-two million, two hundred fifty-two thousand, forty-one".