265768991 has 2 divisors, whose sum is σ = 265768992. Its totient is φ = 265768990.

The previous prime is 265768949. The next prime is 265768999. The reversal of 265768991 is 199867562.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-265768991 is a prime.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265768999) 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, 132884495 + 132884496.

It is an arithmetic number, because the mean of its divisors is an integer number (132884496).

Almost surely, 2^265768991 is an apocalyptic number.

265768991 is a deficient number, since it is larger than the sum of its proper divisors (1).

265768991 is an equidigital number, since it uses as much as digits as its factorization.

265768991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1632960, while the sum is 53.

The square root of 265768991 is about 16302.4228567413. The cubic root of 265768991 is about 642.9365308495.

The spelling of 265768991 in words is "two hundred sixty-five million, seven hundred sixty-eight thousand, nine hundred ninety-one".