19445380500 has 576 divisors, whose sum is σ = 72613352448. Its totient is φ = 4006195200.

The previous prime is 19445380499. The next prime is 19445380511. The reversal of 19445380500 is 508354491.

It is a Harshad number since it is a multiple of its sum of digits (39).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 191 ways as a sum of consecutive naturals, for example, 44908284 + ... + 44908716.

It is an arithmetic number, because the mean of its divisors is an integer number (126064848).

Almost surely, 2^19445380500 is an apocalyptic number.

19445380500 is a gapful number since it is divisible by the number (10) 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 19445380500, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (36306676224).

19445380500 is an abundant number, since it is smaller than the sum of its proper divisors (53167971948).

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

19445380500 is a wasteful number, since it uses less digits than its factorization.

19445380500 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 529 (or 510 counting only the distinct ones).

The product of its (nonzero) digits is 86400, while the sum is 39.

The spelling of 19445380500 in words is "nineteen billion, four hundred forty-five million, three hundred eighty thousand, five hundred".