1309645316857 has 2 divisors, whose sum is σ = 1309645316858. Its totient is φ = 1309645316856.

The previous prime is 1309645316851. The next prime is 1309645316867. The reversal of 1309645316857 is 7586135469031.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 714863486016 + 594781830841 = 845496^2 + 771221^2 .

It is a cyclic number.

It is not a de Polignac number, because 1309645316857 - 2¹⁵ = 1309645284089 is a prime.

It is not a weakly prime, because it can be changed into another prime (1309645316851) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 654822658428 + 654822658429.

It is an arithmetic number, because the mean of its divisors is an integer number (654822658429).

Almost surely, 2^{1309645316857} is an apocalyptic number.

It is an amenable number.

1309645316857 is a deficient number, since it is larger than the sum of its proper divisors (1).

1309645316857 is an equidigital number, since it uses as much as digits as its factorization.

1309645316857 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 16329600, while the sum is 58.

The spelling of 1309645316857 in words is "one trillion, three hundred nine billion, six hundred forty-five million, three hundred sixteen thousand, eight hundred fifty-seven".