266199797 has 2 divisors, whose sum is σ = 266199798. Its totient is φ = 266199796.

The previous prime is 266199781. The next prime is 266199833. The reversal of 266199797 is 797991662.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 237190801 + 29008996 = 15401^2 + 5386^2 .

It is a cyclic number.

It is not a de Polignac number, because 266199797 - 2⁴ = 266199781 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (266199767) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 133099898 + 133099899.

It is an arithmetic number, because the mean of its divisors is an integer number (133099899).

Almost surely, 2^266199797 is an apocalyptic number.

It is an amenable number.

266199797 is a deficient number, since it is larger than the sum of its proper divisors (1).

266199797 is an equidigital number, since it uses as much as digits as its factorization.

266199797 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2571912, while the sum is 56.

The square root of 266199797 is about 16315.6304505833. The cubic root of 266199797 is about 643.2837388873.

The spelling of 266199797 in words is "two hundred sixty-six million, one hundred ninety-nine thousand, seven hundred ninety-seven".