19787269871 has 4 divisors (see below), whose sum is σ = 19787957544. Its totient is φ = 19786582200.

The previous prime is 19787269847. The next prime is 19787269877. The reversal of 19787269871 is 17896278791.

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 19787269871 - 2²² = 19783075567 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 19787269798 and 19787269807.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19787269877) 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, 298700 + ... + 358881.

It is an arithmetic number, because the mean of its divisors is an integer number (4946989386).

Almost surely, 2^19787269871 is an apocalyptic number.

19787269871 is a deficient number, since it is larger than the sum of its proper divisors (687673).

19787269871 is an equidigital number, since it uses as much as digits as its factorization.

19787269871 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 687672.

The product of its digits is 21337344, while the sum is 65.

The spelling of 19787269871 in words is "nineteen billion, seven hundred eighty-seven million, two hundred sixty-nine thousand, eight hundred seventy-one".