19887292897 has 4 divisors (see below), whose sum is σ = 19888521136. Its totient is φ = 19886064660.

The previous prime is 19887292883. The next prime is 19887292921. The reversal of 19887292897 is 79829278891.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 79829278891 = 13003 ⋅6139297.

It is a cyclic number.

It is not a de Polignac number, because 19887292897 - 2²³ = 19878904289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19887299897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 589503 + ... + 622324.

It is an arithmetic number, because the mean of its divisors is an integer number (4972130284).

Almost surely, 2^19887292897 is an apocalyptic number.

It is an amenable number.

19887292897 is a deficient number, since it is larger than the sum of its proper divisors (1228239).

19887292897 is a wasteful number, since it uses less digits than its factorization.

19887292897 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1228238.

The product of its digits is 73156608, while the sum is 70.

The spelling of 19887292897 in words is "nineteen billion, eight hundred eighty-seven million, two hundred ninety-two thousand, eight hundred ninety-seven".