1317171712779 has 48 divisors (see below), whose sum is σ = 2169796356000. Its totient is φ = 762768258048.

The previous prime is 1317171712777. The next prime is 1317171712819. The reversal of 1317171712779 is 9772171717131.

1317171712779 is a `hidden beast` number, since 1 + 317 + 171 + 71 + 27 + 79 = 666.

It is not a de Polignac number, because 1317171712779 - 2¹ = 1317171712777 is a prime.

It is not an unprimeable number, because it can be changed into a prime (1317171712777) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 13674117 + ... + 13770105.

It is an arithmetic number, because the mean of its divisors is an integer number (45204090750).

Almost surely, 2^{1317171712779} is an apocalyptic number.

1317171712779 is a deficient number, since it is larger than the sum of its proper divisors (852624643221).

1317171712779 is a wasteful number, since it uses less digits than its factorization.

1317171712779 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 102924 (or 102921 counting only the distinct ones).

The product of its digits is 907578, while the sum is 54.

The spelling of 1317171712779 in words is "one trillion, three hundred seventeen billion, one hundred seventy-one million, seven hundred twelve thousand, seven hundred seventy-nine".