17981472369 has 8 divisors (see below), whose sum is σ = 27400338880. Its totient is φ = 10275127056.

The previous prime is 17981472349. The next prime is 17981472371. The reversal of 17981472369 is 96327418971.

It is a happy number.

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

It is not a de Polignac number, because 17981472369 - 2²¹ = 17979375217 is a prime.

It is a super-2 number, since 2×17981472369² (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 (17981472319) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 428130274 + ... + 428130315.

It is an arithmetic number, because the mean of its divisors is an integer number (3425042360).

Almost surely, 2^17981472369 is an apocalyptic number.

It is an amenable number.

17981472369 is a deficient number, since it is larger than the sum of its proper divisors (9418866511).

17981472369 is an equidigital number, since it uses as much as digits as its factorization.

17981472369 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 856260599.

The product of its digits is 4572288, while the sum is 57.

The spelling of 17981472369 in words is "seventeen billion, nine hundred eighty-one million, four hundred seventy-two thousand, three hundred sixty-nine".