18918099409980 has 96 divisors (see below), whose sum is σ = 54304686713088. Its totient is φ = 4917968755200.

The previous prime is 18918099409973. The next prime is 18918099409987. The reversal of 18918099409980 is 8990499081981.

It is an interprime number because it is at equal distance from previous prime (18918099409973) and next prime (18918099409987).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18918099409987) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 197439 + ... + 6154281.

It is an arithmetic number, because the mean of its divisors is an integer number (565673819928).

Almost surely, 2^{18918099409980} is an apocalyptic number.

18918099409980 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 18918099409980, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27152343356544).

18918099409980 is an abundant number, since it is smaller than the sum of its proper divisors (35386587303108).

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

18918099409980 is a wasteful number, since it uses less digits than its factorization.

18918099409980 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5958187 (or 5958185 counting only the distinct ones).

The product of its (nonzero) digits is 120932352, while the sum is 75.

The spelling of 18918099409980 in words is "eighteen trillion, nine hundred eighteen billion, ninety-nine million, four hundred nine thousand, nine hundred eighty".