265243316221109 has 2 divisors, whose sum is σ = 265243316221110. Its totient is φ = 265243316221108.

The previous prime is 265243316221057. The next prime is 265243316221171. The reversal of 265243316221109 is 901122613342562.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 235852714105009 + 29390602116100 = 15357497^2 + 5421310^2 .

It is a cyclic number.

It is not a de Polignac number, because 265243316221109 - 2²⁴ = 265243299443893 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265243313221109) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132621658110554 + 132621658110555.

It is an arithmetic number, because the mean of its divisors is an integer number (132621658110555).

Almost surely, 2^{265243316221109} is an apocalyptic number.

It is an amenable number.

265243316221109 is a deficient number, since it is larger than the sum of its proper divisors (1).

265243316221109 is an equidigital number, since it uses as much as digits as its factorization.

265243316221109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 933120, while the sum is 47.

The spelling of 265243316221109 in words is "two hundred sixty-five trillion, two hundred forty-three billion, three hundred sixteen million, two hundred twenty-one thousand, one hundred nine".