17991542418 has 16 divisors (see below), whose sum is σ = 36387390240. Its totient is φ = 5929796576.

The previous prime is 17991542389. The next prime is 17991542419. The reversal of 17991542418 is 81424519971.

It is not an unprimeable number, because it can be changed into a prime (17991542419) 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, 16845480 + ... + 16846547.

It is an arithmetic number, because the mean of its divisors is an integer number (2274211890).

Almost surely, 2^17991542418 is an apocalyptic number.

17991542418 is an abundant number, since it is smaller than the sum of its proper divisors (18395847822).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

17991542418 is a wasteful number, since it uses less digits than its factorization.

17991542418 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 33692121.

The product of its digits is 725760, while the sum is 51.

The spelling of 17991542418 in words is "seventeen billion, nine hundred ninety-one million, five hundred forty-two thousand, four hundred eighteen".