18517829880 has 128 divisors (see below), whose sum is σ = 61067001600. Its totient is φ = 4454860800.

The previous prime is 18517829849. The next prime is 18517829909. The reversal of 18517829880 is 8892871581.

It is a self number, because there is not a number n which added to its sum of digits gives 18517829880.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 119376 + ... + 226464.

It is an arithmetic number, because the mean of its divisors is an integer number (477085950).

Almost surely, 2^18517829880 is an apocalyptic number.

18517829880 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 18517829880, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30533500800).

18517829880 is an abundant number, since it is smaller than the sum of its proper divisors (42549171720).

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

18517829880 is a wasteful number, since it uses less digits than its factorization.

18517829880 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 107245 (or 107241 counting only the distinct ones).

The product of its (nonzero) digits is 2580480, while the sum is 57.

The spelling of 18517829880 in words is "eighteen billion, five hundred seventeen million, eight hundred twenty-nine thousand, eight hundred eighty".