18999819970560 has 864 divisors, whose sum is σ = 77787961524000. Its totient is φ = 4251669626880.

The previous prime is 18999819970559. The next prime is 18999819970583. The reversal of 18999819970560 is 6507991899981.

It is a self number, because there is not a number n which added to its sum of digits gives 18999819970560.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 71 ways as a sum of consecutive naturals, for example, 171269991 + ... + 171380889.

It is an arithmetic number, because the mean of its divisors is an integer number (90032362875).

Almost surely, 2^{18999819970560} is an apocalyptic number.

18999819970560 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 18999819970560, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (38893980762000).

18999819970560 is an abundant number, since it is smaller than the sum of its proper divisors (58788141553440).

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

18999819970560 is a wasteful number, since it uses less digits than its factorization.

18999819970560 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 110969 (or 110933 counting only the distinct ones).

The product of its (nonzero) digits is 793618560, while the sum is 81.

The spelling of 18999819970560 in words is "eighteen trillion, nine hundred ninety-nine billion, eight hundred nineteen million, nine hundred seventy thousand, five hundred sixty".