17391116745 has 20 divisors (see below), whose sum is σ = 31175187780. Its totient is φ = 9275262048.

The previous prime is 17391116719. The next prime is 17391116747. The reversal of 17391116745 is 54761119371.

It can be written as a sum of positive squares in 2 ways, for example, as 3337488441 + 14053628304 = 57771^2 + 118548^2 .

It is a de Polignac number, because none of the positive numbers 2^k-17391116745 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a self number, because there is not a number n which added to its sum of digits gives 17391116745.

It is not an unprimeable number, because it can be changed into a prime (17391116747) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 21470110 + ... + 21470919.

It is an arithmetic number, because the mean of its divisors is an integer number (1558759389).

Almost surely, 2^17391116745 is an apocalyptic number.

17391116745 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

17391116745 is a deficient number, since it is larger than the sum of its proper divisors (13784071035).

17391116745 is an equidigital number, since it uses as much as digits as its factorization.

17391116745 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42941046 (or 42941037 counting only the distinct ones).

The product of its digits is 158760, while the sum is 45.

The spelling of 17391116745 in words is "seventeen billion, three hundred ninety-one million, one hundred sixteen thousand, seven hundred forty-five".