266261197 has 2 divisors, whose sum is σ = 266261198. Its totient is φ = 266261196.

The previous prime is 266261173. The next prime is 266261207. The reversal of 266261197 is 791162662.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 210221001 + 56040196 = 14499^2 + 7486^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-266261197 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266261797) by changing a digit.

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 as a sum of consecutive naturals, namely, 133130598 + 133130599.

It is an arithmetic number, because the mean of its divisors is an integer number (133130599).

Almost surely, 2^266261197 is an apocalyptic number.

It is an amenable number.

266261197 is a deficient number, since it is larger than the sum of its proper divisors (1).

266261197 is an equidigital number, since it uses as much as digits as its factorization.

266261197 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 54432, while the sum is 40.

The square root of 266261197 is about 16317.5119733371. The cubic root of 266261197 is about 643.3331937024. Note that the first 3 decimals are identical.

The spelling of 266261197 in words is "two hundred sixty-six million, two hundred sixty-one thousand, one hundred ninety-seven".