17998534136 has 48 divisors (see below), whose sum is σ = 37117134600. Its totient is φ = 8176069440.

The previous prime is 17998534091. The next prime is 17998534171. The reversal of 17998534136 is 63143589971.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1866335 + ... + 1875953.

Almost surely, 2^17998534136 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 17998534136, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (18558567300).

17998534136 is an abundant number, since it is smaller than the sum of its proper divisors (19118600464).

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

17998534136 is a wasteful number, since it uses less digits than its factorization.

17998534136 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11580 (or 11565 counting only the distinct ones).

The product of its digits is 4898880, while the sum is 56.

The spelling of 17998534136 in words is "seventeen billion, nine hundred ninety-eight million, five hundred thirty-four thousand, one hundred thirty-six".