19717965969 has 16 divisors (see below), whose sum is σ = 29289288000. Its totient is φ = 11715713856.

The previous prime is 19717965961. The next prime is 19717965973. The reversal of 19717965969 is 96956971791.

It is not a de Polignac number, because 19717965969 - 2³ = 19717965961 is a prime.

It is a super-2 number, since 2×19717965969² (a number of 21 digits) contains 22 as substring.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19717965961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 8715919 + ... + 8718180.

It is an arithmetic number, because the mean of its divisors is an integer number (1830580500).

Almost surely, 2^19717965969 is an apocalyptic number.

It is an amenable number.

19717965969 is a deficient number, since it is larger than the sum of its proper divisors (9571322031).

19717965969 is a wasteful number, since it uses less digits than its factorization.

19717965969 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 17434144.

The product of its digits is 57868020, while the sum is 69.

The spelling of 19717965969 in words is "nineteen billion, seven hundred seventeen million, nine hundred sixty-five thousand, nine hundred sixty-nine".