17980371305 has 8 divisors (see below), whose sum is σ = 23236172232. Its totient is φ = 13277812608.

The previous prime is 17980371209. The next prime is 17980371347. The reversal of 17980371305 is 50317308971.

It can be written as a sum of positive squares in 4 ways, for example, as 1542054361 + 16438316944 = 39269^2 + 128212^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 17980371305 - 2¹⁰ = 17980370281 is a prime.

It is a Curzon number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 138310484 + ... + 138310613.

It is an arithmetic number, because the mean of its divisors is an integer number (2904521529).

Almost surely, 2^17980371305 is an apocalyptic number.

It is an amenable number.

17980371305 is a deficient number, since it is larger than the sum of its proper divisors (5255800927).

17980371305 is a wasteful number, since it uses less digits than its factorization.

17980371305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 276621115.

The product of its (nonzero) digits is 158760, while the sum is 44.

The spelling of 17980371305 in words is "seventeen billion, nine hundred eighty million, three hundred seventy-one thousand, three hundred five".