19199335945 has 4 divisors (see below), whose sum is σ = 23039203140. Its totient is φ = 15359468752.

The previous prime is 19199335937. The next prime is 19199336069. The reversal of 19199335945 is 54953399191.

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

It can be written as a sum of positive squares in 2 ways, for example, as 5278167801 + 13921168144 = 72651^2 + 117988^2 .

It is a cyclic number.

It is not a de Polignac number, because 19199335945 - 2³ = 19199335937 is a prime.

It is a super-2 number, since 2×19199335945² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 19199335945.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1919933590 + ... + 1919933599.

It is an arithmetic number, because the mean of its divisors is an integer number (5759800785).

Almost surely, 2^19199335945 is an apocalyptic number.

It is an amenable number.

19199335945 is a deficient number, since it is larger than the sum of its proper divisors (3839867195).

19199335945 is an equidigital number, since it uses as much as digits as its factorization.

19199335945 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3839867194.

The product of its digits is 5904900, while the sum is 58.

The spelling of 19199335945 in words is "nineteen billion, one hundred ninety-nine million, three hundred thirty-five thousand, nine hundred forty-five".