19795565217 has 8 divisors (see below), whose sum is σ = 26399382624. Its totient is φ = 13194395648.

The previous prime is 19795565203. The next prime is 19795565219. The reversal of 19795565217 is 71256559791.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 19795565217 - 2⁴ = 19795565201 is a prime.

It is not an unprimeable number, because it can be changed into a prime (19795565219) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 644448 + ... + 674465.

It is an arithmetic number, because the mean of its divisors is an integer number (3299922828).

Almost surely, 2^19795565217 is an apocalyptic number.

It is an amenable number.

19795565217 is a deficient number, since it is larger than the sum of its proper divisors (6603817407).

19795565217 is a wasteful number, since it uses less digits than its factorization.

19795565217 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1323919.

The product of its digits is 5953500, while the sum is 57.

The spelling of 19795565217 in words is "nineteen billion, seven hundred ninety-five million, five hundred sixty-five thousand, two hundred seventeen".