19445572650 has 48 divisors (see below), whose sum is σ = 55114311744. Its totient is φ = 4444702080.

The previous prime is 19445572649. The next prime is 19445572711. The reversal of 19445572650 is 5627554491.

It is a self number, because there is not a number n which added to its sum of digits gives 19445572650.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 9258747 + ... + 9260846.

It is an arithmetic number, because the mean of its divisors is an integer number (1148214828).

Almost surely, 2^19445572650 is an apocalyptic number.

19445572650 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

19445572650 is an abundant number, since it is smaller than the sum of its proper divisors (35668739094).

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

19445572650 is a wasteful number, since it uses less digits than its factorization.

19445572650 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18519615 (or 18519610 counting only the distinct ones).

The product of its (nonzero) digits is 1512000, while the sum is 48.

The spelling of 19445572650 in words is "nineteen billion, four hundred forty-five million, five hundred seventy-two thousand, six hundred fifty".