19428199085 has 4 divisors (see below), whose sum is σ = 23313838908. Its totient is φ = 15542559264.

The previous prime is 19428199079. The next prime is 19428199127. The reversal of 19428199085 is 58099182491.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 58099182491 = 7 ⋅8299883213.

It can be written as a sum of positive squares in 2 ways, for example, as 6493458724 + 12934740361 = 80582^2 + 113731^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-19428199085 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 19428199085.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1942819904 + ... + 1942819913.

It is an arithmetic number, because the mean of its divisors is an integer number (5828459727).

Almost surely, 2^19428199085 is an apocalyptic number.

It is an amenable number.

19428199085 is a deficient number, since it is larger than the sum of its proper divisors (3885639823).

19428199085 is an equidigital number, since it uses as much as digits as its factorization.

19428199085 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3885639822.

The product of its (nonzero) digits is 1866240, while the sum is 56.

The spelling of 19428199085 in words is "nineteen billion, four hundred twenty-eight million, one hundred ninety-nine thousand, eighty-five".