265809318287 has 2 divisors, whose sum is σ = 265809318288. Its totient is φ = 265809318286.

The previous prime is 265809318241. The next prime is 265809318289. The reversal of 265809318287 is 782813908562.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 265809318287 - 2⁸ = 265809318031 is a prime.

It is a super-2 number, since 2×265809318287² (a number of 24 digits) contains 22 as substring.

Together with 265809318289, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (265809318289) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 132904659143 + 132904659144.

It is an arithmetic number, because the mean of its divisors is an integer number (132904659144).

Almost surely, 2^265809318287 is an apocalyptic number.

265809318287 is a deficient number, since it is larger than the sum of its proper divisors (1).

265809318287 is an equidigital number, since it uses as much as digits as its factorization.

265809318287 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 11612160, while the sum is 59.

The spelling of 265809318287 in words is "two hundred sixty-five billion, eight hundred nine million, three hundred eighteen thousand, two hundred eighty-seven".