1318568385689 has 16 divisors (see below), whose sum is σ = 1468836842256. Its totient is φ = 1178014464000.

The previous prime is 1318568385683. The next prime is 1318568385707. The reversal of 1318568385689 is 9865838658131.

It can be written as a sum of positive squares in 8 ways, for example, as 49509810064 + 1269058575625 = 222508^2 + 1126525^2 .

It is a cyclic number.

It is not a de Polignac number, because 1318568385689 - 2¹² = 1318568381593 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (1318568385683) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 25538762 + ... + 25590339.

It is an arithmetic number, because the mean of its divisors is an integer number (91802302641).

Almost surely, 2^{1318568385689} is an apocalyptic number.

It is an amenable number.

1318568385689 is a deficient number, since it is larger than the sum of its proper divisors (150268456567).

1318568385689 is a wasteful number, since it uses less digits than its factorization.

1318568385689 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 51129196.

The product of its digits is 298598400, while the sum is 71.

The spelling of 1318568385689 in words is "one trillion, three hundred eighteen billion, five hundred sixty-eight million, three hundred eighty-five thousand, six hundred eighty-nine".