19689901857 has 48 divisors (see below), whose sum is σ = 31193735040. Its totient is φ = 11912603136.

The previous prime is 19689901853. The next prime is 19689901867. The reversal of 19689901857 is 75810998691.

It is not a de Polignac number, because 19689901857 - 2² = 19689901853 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 19689901794 and 19689901803.

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 47 ways as a sum of consecutive naturals, for example, 3933118 + ... + 3938120.

It is an arithmetic number, because the mean of its divisors is an integer number (649869480).

Almost surely, 2^19689901857 is an apocalyptic number.

19689901857 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

19689901857 is a deficient number, since it is larger than the sum of its proper divisors (11503833183).

19689901857 is a wasteful number, since it uses less digits than its factorization.

19689901857 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5942 (or 5939 counting only the distinct ones).

The product of its (nonzero) digits is 9797760, while the sum is 63.

The spelling of 19689901857 in words is "nineteen billion, six hundred eighty-nine million, nine hundred one thousand, eight hundred fifty-seven".