17981693472959 has 4 divisors (see below), whose sum is σ = 17987027707560. Its totient is φ = 17976359238360.

The previous prime is 17981693472947. The next prime is 17981693472961. The reversal of 17981693472959 is 95927439618971.

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

It is a cyclic number.

It is not a de Polignac number, because 17981693472959 - 2³² = 17977398505663 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (17981693475959) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2667112244 + ... + 2667118985.

It is an arithmetic number, because the mean of its divisors is an integer number (4496756926890).

Almost surely, 2^{17981693472959} is an apocalyptic number.

17981693472959 is a deficient number, since it is larger than the sum of its proper divisors (5334234601).

17981693472959 is an equidigital number, since it uses as much as digits as its factorization.

17981693472959 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5334234600.

The product of its digits is 1851776640, while the sum is 80.

The spelling of 17981693472959 in words is "seventeen trillion, nine hundred eighty-one billion, six hundred ninety-three million, four hundred seventy-two thousand, nine hundred fifty-nine".