266856975475199 has 2 divisors, whose sum is σ = 266856975475200. Its totient is φ = 266856975475198.

The previous prime is 266856975475171. The next prime is 266856975475213. The reversal of 266856975475199 is 991574579658662.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 266856975475199 - 2²⁴ = 266856958697983 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266856975477199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133428487737599 + 133428487737600.

It is an arithmetic number, because the mean of its divisors is an integer number (133428487737600).

Almost surely, 2^{266856975475199} is an apocalyptic number.

266856975475199 is a deficient number, since it is larger than the sum of its proper divisors (1).

266856975475199 is an equidigital number, since it uses as much as digits as its factorization.

266856975475199 is an evil number, because the sum of its binary digits is even.

The product of its digits is 61725888000, while the sum is 89.

The spelling of 266856975475199 in words is "two hundred sixty-six trillion, eight hundred fifty-six billion, nine hundred seventy-five million, four hundred seventy-five thousand, one hundred ninety-nine".