19818942864 has 480 divisors, whose sum is σ = 66701445120. Its totient is φ = 4943296512.

The previous prime is 19818942859. The next prime is 19818942881. The reversal of 19818942864 is 46824981891.

It is a junction number, because it is equal to n+sod(n) for n = 19818942798 and 19818942807.

It is an unprimeable number.

It is a polite number, since it can be written in 95 ways as a sum of consecutive naturals, for example, 271492332 + ... + 271492404.

It is an arithmetic number, because the mean of its divisors is an integer number (138961344).

Almost surely, 2^19818942864 is an apocalyptic number.

19818942864 is a gapful number since it is divisible by the number (14) 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 19818942864, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33350722560).

19818942864 is an abundant number, since it is smaller than the sum of its proper divisors (46882502256).

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

19818942864 is a wasteful number, since it uses less digits than its factorization.

19818942864 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 219 (or 170 counting only the distinct ones).

The product of its digits is 7962624, while the sum is 60.

The spelling of 19818942864 in words is "nineteen billion, eight hundred eighteen million, nine hundred forty-two thousand, eight hundred sixty-four".