19795793665 has 4 divisors (see below), whose sum is σ = 23754952404. Its totient is φ = 15836634928.

The previous prime is 19795793651. The next prime is 19795793707. The reversal of 19795793665 is 56639759791.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 56639759791 = 19 ⋅2981039989.

It can be written as a sum of positive squares in 2 ways, for example, as 8771633649 + 11024160016 = 93657^2 + 104996^2 .

It is a cyclic number.

It is not a de Polignac number, because 19795793665 - 2³³ = 11205859073 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19795793665.

It is an unprimeable number.

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 3 ways as a sum of consecutive naturals, for example, 1979579362 + ... + 1979579371.

It is an arithmetic number, because the mean of its divisors is an integer number (5938738101).

Almost surely, 2^19795793665 is an apocalyptic number.

It is an amenable number.

19795793665 is a deficient number, since it is larger than the sum of its proper divisors (3959158739).

19795793665 is an equidigital number, since it uses as much as digits as its factorization.

19795793665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3959158738.

The product of its digits is 96446700, while the sum is 67.

The spelling of 19795793665 in words is "nineteen billion, seven hundred ninety-five million, seven hundred ninety-three thousand, six hundred sixty-five".