1265816916341 has 2 divisors, whose sum is σ = 1265816916342. Its totient is φ = 1265816916340.

The previous prime is 1265816916293. The next prime is 1265816916479. The reversal of 1265816916341 is 1436196185621.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1246898289316 + 18918627025 = 1116646^2 + 137545^2 .

It is an emirp because it is prime and its reverse (1436196185621) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1265816916341 - 2²⁶ = 1265749807477 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1265816918341) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 632908458170 + 632908458171.

It is an arithmetic number, because the mean of its divisors is an integer number (632908458171).

Almost surely, 2^{1265816916341} is an apocalyptic number.

It is an amenable number.

1265816916341 is a deficient number, since it is larger than the sum of its proper divisors (1).

1265816916341 is an equidigital number, since it uses as much as digits as its factorization.

1265816916341 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1866240, while the sum is 53.

The spelling of 1265816916341 in words is "one trillion, two hundred sixty-five billion, eight hundred sixteen million, nine hundred sixteen thousand, three hundred forty-one".