266142397 has 2 divisors, whose sum is σ = 266142398. Its totient is φ = 266142396.

The previous prime is 266142377. The next prime is 266142403. The reversal of 266142397 is 793241662.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 182493081 + 83649316 = 13509^2 + 9146^2 .

It is a cyclic number.

It is not a de Polignac number, because 266142397 - 2¹⁹ = 265618109 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 (266142377) 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, 133071198 + 133071199.

It is an arithmetic number, because the mean of its divisors is an integer number (133071199).

Almost surely, 2^266142397 is an apocalyptic number.

It is an amenable number.

266142397 is a deficient number, since it is larger than the sum of its proper divisors (1).

266142397 is an equidigital number, since it uses as much as digits as its factorization.

266142397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 108864, while the sum is 40.

The square root of 266142397 is about 16313.8713063454. The cubic root of 266142397 is about 643.2374990062.

The spelling of 266142397 in words is "two hundred sixty-six million, one hundred forty-two thousand, three hundred ninety-seven".