19533416644 has 81 divisors (see below), whose sum is σ = 40639549293. Its totient is φ = 8191171296.

The previous prime is 19533416641. The next prime is 19533416663. The reversal of 19533416644 is 44661433591.

The square root of 19533416644 is 139762.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 2288474244 + 17244942400 = 47838^2 + 131320^2 .

It is a junction number, because it is equal to n+sod(n) for n = 19533416594 and 19533416603.

It is not an unprimeable number, because it can be changed into a prime (19533416641) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 131096682 + ... + 131096830.

Almost surely, 2^19533416644 is an apocalyptic number.

19533416644 is a gapful number since it is divisible by the number (14) formed by its first and last digit.

19533416644 is the 139762-nd square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19533416644

19533416644 is an abundant number, since it is smaller than the sum of its proper divisors (21106132649).

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

19533416644 is an equidigital number, since it uses as much as digits as its factorization.

19533416644 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 450 (or 225 counting only the distinct ones).

The product of its digits is 933120, while the sum is 46.

The spelling of 19533416644 in words is "nineteen billion, five hundred thirty-three million, four hundred sixteen thousand, six hundred forty-four".