19799453544 has 128 divisors (see below), whose sum is σ = 55362531840. Its totient is φ = 5861382912.

The previous prime is 19799453537. The next prime is 19799453551. The reversal of 19799453544 is 44535499791.

It is an interprime number because it is at equal distance from previous prime (19799453537) and next prime (19799453551).

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 31 ways as a sum of consecutive naturals, for example, 887859 + ... + 909885.

It is an arithmetic number, because the mean of its divisors is an integer number (432519780).

Almost surely, 2^19799453544 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19799453544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27681265920).

19799453544 is an abundant number, since it is smaller than the sum of its proper divisors (35563078296).

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

19799453544 is a wasteful number, since it uses less digits than its factorization.

19799453544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22159 (or 22155 counting only the distinct ones).

The product of its digits is 24494400, while the sum is 60.

The spelling of 19799453544 in words is "nineteen billion, seven hundred ninety-nine million, four hundred fifty-three thousand, five hundred forty-four".