19445943216 has 320 divisors, whose sum is σ = 61924608000. Its totient is φ = 5245599744.

The previous prime is 19445943203. The next prime is 19445943229. The reversal of 19445943216 is 61234954491.

It is an interprime number because it is at equal distance from previous prime (19445943203) and next prime (19445943229).

It is a Harshad number since it is a multiple of its sum of digits (48).

It is an unprimeable number.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 33701520 + ... + 33702096.

It is an arithmetic number, because the mean of its divisors is an integer number (193514400).

Almost surely, 2^19445943216 is an apocalyptic number.

19445943216 is a gapful number since it is divisible by the number (16) 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 19445943216, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (30962304000).

19445943216 is an abundant number, since it is smaller than the sum of its proper divisors (42478664784).

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

19445943216 is a wasteful number, since it uses less digits than its factorization.

19445943216 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 721 (or 701 counting only the distinct ones).

The product of its digits is 933120, while the sum is 48.

The spelling of 19445943216 in words is "nineteen billion, four hundred forty-five million, nine hundred forty-three thousand, two hundred sixteen".