19447916544 has 432 divisors, whose sum is σ = 66598901460. Its totient is φ = 5449973760.

The previous prime is 19447916533. The next prime is 19447916563. The reversal of 19447916544 is 44561974491.

It is a happy number.

19447916544 is a `hidden beast` number, since 1 + 9 + 4 + 4 + 7 + 91 + 6 + 544 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 17171481600 + 2276434944 = 131040^2 + 47712^2 .

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 55093072 + ... + 55093424.

Almost surely, 2^19447916544 is an apocalyptic number.

19447916544 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 19447916544, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (33299450730).

19447916544 is an abundant number, since it is smaller than the sum of its proper divisors (47150984916).

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

19447916544 is a wasteful number, since it uses less digits than its factorization.

19447916544 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 456 (or 426 counting only the distinct ones).

The product of its digits is 4354560, while the sum is 54.

The spelling of 19447916544 in words is "nineteen billion, four hundred forty-seven million, nine hundred sixteen thousand, five hundred forty-four".