19836905065 has 32 divisors (see below), whose sum is σ = 25499975040. Its totient is φ = 14769216000.

The previous prime is 19836905063. The next prime is 19836905071. The reversal of 19836905065 is 56050963891.

It is not a de Polignac number, because 19836905065 - 2¹ = 19836905063 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19836905063) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 6088917 + ... + 6092173.

It is an arithmetic number, because the mean of its divisors is an integer number (796874220).

Almost surely, 2^19836905065 is an apocalyptic number.

It is an amenable number.

19836905065 is a deficient number, since it is larger than the sum of its proper divisors (5663069975).

19836905065 is a wasteful number, since it uses less digits than its factorization.

19836905065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4393.

The product of its (nonzero) digits is 1749600, while the sum is 52.

The spelling of 19836905065 in words is "nineteen billion, eight hundred thirty-six million, nine hundred five thousand, sixty-five".