19897102847 has 4 divisors (see below), whose sum is σ = 20030640600. Its totient is φ = 19763565096.

The previous prime is 19897102801. The next prime is 19897102871. The reversal of 19897102847 is 74820179891.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19897102847 - 2¹² = 19897098751 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19897102792 and 19897102801.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19897102877) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 66768653 + ... + 66768950.

It is an arithmetic number, because the mean of its divisors is an integer number (5007660150).

Almost surely, 2^19897102847 is an apocalyptic number.

19897102847 is a deficient number, since it is larger than the sum of its proper divisors (133537753).

19897102847 is a wasteful number, since it uses less digits than its factorization.

19897102847 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 133537752.

The product of its (nonzero) digits is 2032128, while the sum is 56.

The spelling of 19897102847 in words is "nineteen billion, eight hundred ninety-seven million, one hundred two thousand, eight hundred forty-seven".