19985717314799 has 4 divisors (see below), whose sum is σ = 19985951844864. Its totient is φ = 19985482784736.

The previous prime is 19985717314789. The next prime is 19985717314813. The reversal of 19985717314799 is 99741371758991.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 19985717314799 - 2¹² = 19985717310703 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19985717314789) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 117137162 + ... + 117307655.

It is an arithmetic number, because the mean of its divisors is an integer number (4996487961216).

Almost surely, 2^{19985717314799} is an apocalyptic number.

19985717314799 is a deficient number, since it is larger than the sum of its proper divisors (234530065).

19985717314799 is an equidigital number, since it uses as much as digits as its factorization.

19985717314799 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 234530064.

The product of its digits is 1080203040, while the sum is 80.

The spelling of 19985717314799 in words is "nineteen trillion, nine hundred eighty-five billion, seven hundred seventeen million, three hundred fourteen thousand, seven hundred ninety-nine".