19688579856 has 135 divisors (see below), whose sum is σ = 60622237767. Its totient is φ = 5960623680.

The previous prime is 19688579839. The next prime is 19688579909. The reversal of 19688579856 is 65897588691.

The square root of 19688579856 is 140316.

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

It is a Harshad number since it is a multiple of its sum of digits (72).

It is an unprimeable number.

It is a polite number, since it can be written in 26 ways as a sum of consecutive naturals, for example, 18521181 + ... + 18522243.

Almost surely, 2^19688579856 is an apocalyptic number.

19688579856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

19688579856 is the 140316-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 19688579856

19688579856 is an abundant number, since it is smaller than the sum of its proper divisors (40933657911).

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

19688579856 is a wasteful number, since it uses less digits than its factorization.

19688579856 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2162 (or 1079 counting only the distinct ones).

The product of its digits is 261273600, while the sum is 72.

The spelling of 19688579856 in words is "nineteen billion, six hundred eighty-eight million, five hundred seventy-nine thousand, eight hundred fifty-six".