19816847897 has 32 divisors (see below), whose sum is σ = 25000254720. Its totient is φ = 15258746880.

The previous prime is 19816847893. The next prime is 19816847927. The reversal of 19816847897 is 79874861891.

It is a cyclic number.

It is not a de Polignac number, because 19816847897 - 2² = 19816847893 is a prime.

It is a super-3 number, since 3×19816847897³ (a number of 32 digits) contains 333 as substring.

It is not an unprimeable number, because it can be changed into a prime (19816847893) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 5951129 + ... + 5954457.

It is an arithmetic number, because the mean of its divisors is an integer number (781257960).

Almost surely, 2^19816847897 is an apocalyptic number.

It is an amenable number.

19816847897 is a deficient number, since it is larger than the sum of its proper divisors (5183406823).

19816847897 is a wasteful number, since it uses less digits than its factorization.

19816847897 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4241.

The product of its digits is 48771072, while the sum is 68.

The spelling of 19816847897 in words is "nineteen billion, eight hundred sixteen million, eight hundred forty-seven thousand, eight hundred ninety-seven".