19018340544 has 112 divisors (see below), whose sum is σ = 57696412928. Its totient is φ = 5415994368.

The previous prime is 19018340519. The next prime is 19018340557. The reversal of 19018340544 is 44504381091.

It is a tau number, because it is divible by the number of its divisors (112).

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 389562 + ... + 435654.

It is an arithmetic number, because the mean of its divisors is an integer number (515146544).

Almost surely, 2^19018340544 is an apocalyptic number.

19018340544 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 19018340544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (28848206464).

19018340544 is an abundant number, since it is smaller than the sum of its proper divisors (38678072384).

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

19018340544 is a wasteful number, since it uses less digits than its factorization.

19018340544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46422 (or 46412 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 39.

The spelling of 19018340544 in words is "nineteen billion, eighteen million, three hundred forty thousand, five hundred forty-four".