18821098680 has 128 divisors (see below), whose sum is σ = 56793381120. Its totient is φ = 4989726720.

The previous prime is 18821098649. The next prime is 18821098693. The reversal of 18821098680 is 8689012881.

It is a happy number.

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, 27237135 + ... + 27237825.

It is an arithmetic number, because the mean of its divisors is an integer number (443698290).

Almost surely, 2^18821098680 is an apocalyptic number.

18821098680 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 18821098680, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28396690560).

18821098680 is an abundant number, since it is smaller than the sum of its proper divisors (37972282440).

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

18821098680 is a wasteful number, since it uses less digits than its factorization.

18821098680 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1701 (or 1697 counting only the distinct ones).

The product of its (nonzero) digits is 442368, while the sum is 51.

The spelling of 18821098680 in words is "eighteen billion, eight hundred twenty-one million, ninety-eight thousand, six hundred eighty".