19849809711 has 4 divisors (see below), whose sum is σ = 26466412952. Its totient is φ = 13233206472.

The previous prime is 19849809709. The next prime is 19849809767. The reversal of 19849809711 is 11790894891.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11790894891 = 3 ⋅3930298297.

It is not a de Polignac number, because 19849809711 - 2¹ = 19849809709 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19849809011) 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, 3308301616 + ... + 3308301621.

It is an arithmetic number, because the mean of its divisors is an integer number (6616603238).

Almost surely, 2^19849809711 is an apocalyptic number.

19849809711 is a deficient number, since it is larger than the sum of its proper divisors (6616603241).

19849809711 is an equidigital number, since it uses as much as digits as its factorization.

19849809711 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6616603240.

The product of its (nonzero) digits is 1306368, while the sum is 57.

The spelling of 19849809711 in words is "nineteen billion, eight hundred forty-nine million, eight hundred nine thousand, seven hundred eleven".