19808318811 has 16 divisors (see below), whose sum is σ = 27037767680. Its totient is φ = 12892491360.

The previous prime is 19808318801. The next prime is 19808318851. The reversal of 19808318811 is 11881380891.

It is not a de Polignac number, because 19808318811 - 2¹¹ = 19808316763 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19808318801) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 254541 + ... + 323121.

It is an arithmetic number, because the mean of its divisors is an integer number (1689860480).

Almost surely, 2^19808318811 is an apocalyptic number.

19808318811 is a deficient number, since it is larger than the sum of its proper divisors (7229448869).

19808318811 is a wasteful number, since it uses less digits than its factorization.

19808318811 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 70866.

The product of its (nonzero) digits is 110592, while the sum is 48.

The spelling of 19808318811 in words is "nineteen billion, eight hundred eight million, three hundred eighteen thousand, eight hundred eleven".