266133397 has 2 divisors, whose sum is σ = 266133398. Its totient is φ = 266133396.

The previous prime is 266133379. The next prime is 266133403. The reversal of 266133397 is 793331662.

Together with previous prime (266133379) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 236113956 + 30019441 = 15366^2 + 5479^2 .

It is a cyclic number.

It is not a de Polignac number, because 266133397 - 2⁷ = 266133269 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266133367) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133066698 + 133066699.

It is an arithmetic number, because the mean of its divisors is an integer number (133066699).

Almost surely, 2^266133397 is an apocalyptic number.

It is an amenable number.

266133397 is a deficient number, since it is larger than the sum of its proper divisors (1).

266133397 is an equidigital number, since it uses as much as digits as its factorization.

266133397 is an evil number, because the sum of its binary digits is even.

The product of its digits is 122472, while the sum is 40.

The square root of 266133397 is about 16313.5954651328. The cubic root of 266133397 is about 643.2302482477.

The spelling of 266133397 in words is "two hundred sixty-six million, one hundred thirty-three thousand, three hundred ninety-seven".