19928513779199 has 8 divisors (see below), whose sum is σ = 20168932679280. Its totient is φ = 19688102410816.

The previous prime is 19928513779177. The next prime is 19928513779211. The reversal of 19928513779199 is 99197731582991.

It is a happy number.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19928513779199 is a prime.

It is a super-2 number, since 2×19928513779199² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (19928513779399) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 3534347 + ... + 7235235.

It is an arithmetic number, because the mean of its divisors is an integer number (2521116584910).

Almost surely, 2^{19928513779199} is an apocalyptic number.

19928513779199 is a deficient number, since it is larger than the sum of its proper divisors (240418900081).

19928513779199 is an equidigital number, since it uses as much as digits as its factorization.

19928513779199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3765849.

The product of its digits is 694416240, while the sum is 80.

The spelling of 19928513779199 in words is "nineteen trillion, nine hundred twenty-eight billion, five hundred thirteen million, seven hundred seventy-nine thousand, one hundred ninety-nine".