19689901856 has 48 divisors (see below), whose sum is σ = 41321347200. Its totient is φ = 9208712448.

The previous prime is 19689901853. The next prime is 19689901867. The reversal of 19689901856 is 65810998691.

It is not an unprimeable number, because it can be changed into a prime (19689901853) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 156935 + ... + 252998.

It is an arithmetic number, because the mean of its divisors is an integer number (860861400).

Almost surely, 2^19689901856 is an apocalyptic number.

19689901856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

19689901856 is an abundant number, since it is smaller than the sum of its proper divisors (21631445344).

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

19689901856 is a wasteful number, since it uses less digits than its factorization.

19689901856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 410041 (or 410033 counting only the distinct ones).

The product of its (nonzero) digits is 8398080, while the sum is 62.

The spelling of 19689901856 in words is "nineteen billion, six hundred eighty-nine million, nine hundred one thousand, eight hundred fifty-six".