266626397 has 2 divisors, whose sum is σ = 266626398. Its totient is φ = 266626396.

The previous prime is 266626361. The next prime is 266626427. The reversal of 266626397 is 793626662.

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., 168636196 + 97990201 = 12986^2 + 9899^2 .

It is a cyclic number.

It is not a de Polignac number, because 266626397 - 2⁶ = 266626333 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266626307) 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, 133313198 + 133313199.

It is an arithmetic number, because the mean of its divisors is an integer number (133313199).

Almost surely, 2^266626397 is an apocalyptic number.

It is an amenable number.

266626397 is a deficient number, since it is larger than the sum of its proper divisors (1).

266626397 is an equidigital number, since it uses as much as digits as its factorization.

266626397 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 979776, while the sum is 47.

The square root of 266626397 is about 16328.6985703087. The cubic root of 266626397 is about 643.6271881596.

The spelling of 266626397 in words is "two hundred sixty-six million, six hundred twenty-six thousand, three hundred ninety-seven".