19780247199 has 4 divisors (see below), whose sum is σ = 26373662936. Its totient is φ = 13186831464.

The previous prime is 19780247189. The next prime is 19780247219. The reversal of 19780247199 is 99174208791.

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

It is not a de Polignac number, because 19780247199 - 2⁸ = 19780246943 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 (19780247129) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 3296707864 + ... + 3296707869.

It is an arithmetic number, because the mean of its divisors is an integer number (6593415734).

Almost surely, 2^19780247199 is an apocalyptic number.

19780247199 is a deficient number, since it is larger than the sum of its proper divisors (6593415737).

19780247199 is an equidigital number, since it uses as much as digits as its factorization.

19780247199 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6593415736.

The product of its (nonzero) digits is 2286144, while the sum is 57.

The spelling of 19780247199 in words is "nineteen billion, seven hundred eighty million, two hundred forty-seven thousand, one hundred ninety-nine".