18021519270976 has 63 divisors (see below), whose sum is σ = 38724888174021. Its totient is φ = 8317420510464.

The previous prime is 18021519270919. The next prime is 18021519271001. The reversal of 18021519270976 is 67907291512081.

The square root of 18021519270976 is 4245176.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2665905217600 + 15355614053376 = 1632760^2 + 3918624^2 .

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 18021519270976.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 441477895 + ... + 441518713.

It is an arithmetic number, because the mean of its divisors is an integer number (614680764667).

Almost surely, 2^{18021519270976} is an apocalyptic number.

18021519270976 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

18021519270976 is the 4245176-th square number.

It is an amenable number.

18021519270976 is an abundant number, since it is smaller than the sum of its proper divisors (20703368903045).

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

18021519270976 is an frugal number, since it uses more digits than its factorization.

18021519270976 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 81676 (or 40834 counting only the distinct ones).

The product of its (nonzero) digits is 3810240, while the sum is 58.

The spelling of 18021519270976 in words is "eighteen trillion, twenty-one billion, five hundred nineteen million, two hundred seventy thousand, nine hundred seventy-six".