266402197 has 2 divisors, whose sum is σ = 266402198. Its totient is φ = 266402196.

The previous prime is 266402177. The next prime is 266402231. The reversal of 266402197 is 791204662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235499716 + 30902481 = 15346^2 + 5559^2 .

It is a cyclic number.

It is not a de Polignac number, because 266402197 - 2⁷ = 266402069 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266402167) 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, 133201098 + 133201099.

It is an arithmetic number, because the mean of its divisors is an integer number (133201099).

Almost surely, 2^266402197 is an apocalyptic number.

It is an amenable number.

266402197 is a deficient number, since it is larger than the sum of its proper divisors (1).

266402197 is an equidigital number, since it uses as much as digits as its factorization.

266402197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 266402197 is about 16321.8319131156. The cubic root of 266402197 is about 643.4467338077.

The spelling of 266402197 in words is "two hundred sixty-six million, four hundred two thousand, one hundred ninety-seven".