19181828199 has 4 divisors (see below), whose sum is σ = 25575770936. Its totient is φ = 12787885464.

The previous prime is 19181828189. The next prime is 19181828207. The reversal of 19181828199 is 99182818191.

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

It is not a de Polignac number, because 19181828199 - 2¹⁷ = 19181697127 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 (19181828189) 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, 3196971364 + ... + 3196971369.

It is an arithmetic number, because the mean of its divisors is an integer number (6393942734).

Almost surely, 2^19181828199 is an apocalyptic number.

19181828199 is a deficient number, since it is larger than the sum of its proper divisors (6393942737).

19181828199 is an equidigital number, since it uses as much as digits as its factorization.

19181828199 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6393942736.

The product of its digits is 746496, while the sum is 57.

The spelling of 19181828199 in words is "nineteen billion, one hundred eighty-one million, eight hundred twenty-eight thousand, one hundred ninety-nine".