17939326913 has 4 divisors (see below), whose sum is σ = 17939980740. Its totient is φ = 17938673088.

The previous prime is 17939326879. The next prime is 17939326931. The reversal of 17939326913 is 31962393971.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 4357056064 + 13582270849 = 66008^2 + 116543^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-17939326913 is a prime.

It is a super-2 number, since 2×17939326913² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17939326943) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 283868 + ... + 341261.

It is an arithmetic number, because the mean of its divisors is an integer number (4484995185).

Almost surely, 2^17939326913 is an apocalyptic number.

It is an amenable number.

17939326913 is a deficient number, since it is larger than the sum of its proper divisors (653827).

17939326913 is an equidigital number, since it uses as much as digits as its factorization.

17939326913 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 653826.

The product of its digits is 1653372, while the sum is 53.

The spelling of 17939326913 in words is "seventeen billion, nine hundred thirty-nine million, three hundred twenty-six thousand, nine hundred thirteen".