17808994980 has 216 divisors, whose sum is σ = 65584454208. Its totient is φ = 3831100416.

The previous prime is 17808994961. The next prime is 17808994981. The reversal of 17808994980 is 8949980871.

It is a Harshad number since it is a multiple of its sum of digits (63).

It is not an unprimeable number, because it can be changed into a prime (17808994981) by changing a digit.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 339687 + ... + 388593.

Almost surely, 2^17808994980 is an apocalyptic number.

17808994980 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 17808994980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32792227104).

17808994980 is an abundant number, since it is smaller than the sum of its proper divisors (47775459228).

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

17808994980 is a wasteful number, since it uses less digits than its factorization.

17808994980 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 48963 (or 48941 counting only the distinct ones).

The product of its (nonzero) digits is 10450944, while the sum is 63.

The spelling of 17808994980 in words is "seventeen billion, eight hundred eight million, nine hundred ninety-four thousand, nine hundred eighty".