1311646517537 has 2 divisors, whose sum is σ = 1311646517538. Its totient is φ = 1311646517536.

The previous prime is 1311646517509. The next prime is 1311646517539. The reversal of 1311646517537 is 7357156461131.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1291129965841 + 20516551696 = 1136279^2 + 143236^2 .

It is a cyclic number.

It is not a de Polignac number, because 1311646517537 - 2³⁴ = 1294466648353 is a prime.

Together with 1311646517539, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1311646517539) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 655823258768 + 655823258769.

It is an arithmetic number, because the mean of its divisors is an integer number (655823258769).

Almost surely, 2^{1311646517537} is an apocalyptic number.

It is an amenable number.

1311646517537 is a deficient number, since it is larger than the sum of its proper divisors (1).

1311646517537 is an equidigital number, since it uses as much as digits as its factorization.

1311646517537 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1587600, while the sum is 50.

The spelling of 1311646517537 in words is "one trillion, three hundred eleven billion, six hundred forty-six million, five hundred seventeen thousand, five hundred thirty-seven".