19779840005 has 16 divisors (see below), whose sum is σ = 24505832448. Its totient is φ = 15310704000.

The previous prime is 19779839987. The next prime is 19779840007. The reversal of 19779840005 is 50004897791.

It is not a de Polignac number, because 19779840005 - 2⁶ = 19779839941 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19779840007) 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, 1604465 + ... + 1616745.

It is an arithmetic number, because the mean of its divisors is an integer number (1531614528).

Almost surely, 2^19779840005 is an apocalyptic number.

It is an amenable number.

19779840005 is a deficient number, since it is larger than the sum of its proper divisors (4725992443).

19779840005 is a wasteful number, since it uses less digits than its factorization.

19779840005 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 22708.

The product of its (nonzero) digits is 635040, while the sum is 50.

The spelling of 19779840005 in words is "nineteen billion, seven hundred seventy-nine million, eight hundred forty thousand, five".