17986648971 has 4 divisors (see below), whose sum is σ = 23982198632. Its totient is φ = 11991099312.

The previous prime is 17986648921. The next prime is 17986649017. The reversal of 17986648971 is 17984668971.

It is a happy number.

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

It is not a de Polignac number, because 17986648971 - 2¹³ = 17986640779 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (17986648921) 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, 2997774826 + ... + 2997774831.

It is an arithmetic number, because the mean of its divisors is an integer number (5995549658).

Almost surely, 2^17986648971 is an apocalyptic number.

17986648971 is a deficient number, since it is larger than the sum of its proper divisors (5995549661).

17986648971 is an equidigital number, since it uses as much as digits as its factorization.

17986648971 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5995549660.

The product of its digits is 36578304, while the sum is 66.

The spelling of 17986648971 in words is "seventeen billion, nine hundred eighty-six million, six hundred forty-eight thousand, nine hundred seventy-one".