18201980016 has 320 divisors, whose sum is σ = 58350551040. Its totient is φ = 5386383360.

The previous prime is 18201979931. The next prime is 18201980033. The reversal of 18201980016 is 61008910281.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 47524561 + ... + 47524943.

It is an arithmetic number, because the mean of its divisors is an integer number (182345472).

Almost surely, 2^18201980016 is an apocalyptic number.

18201980016 is a gapful number since it is divisible by the number (16) 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 18201980016, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (29175275520).

18201980016 is an abundant number, since it is smaller than the sum of its proper divisors (40148571024).

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

18201980016 is a wasteful number, since it uses less digits than its factorization.

18201980016 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 621 (or 609 counting only the distinct ones).

The product of its (nonzero) digits is 6912, while the sum is 36.

The spelling of 18201980016 in words is "eighteen billion, two hundred one million, nine hundred eighty thousand, sixteen".