19018193819 has 12 divisors (see below), whose sum is σ = 19499427000. Its totient is φ = 18546447744.

The previous prime is 19018193807. The next prime is 19018193851. The reversal of 19018193819 is 91839181091.

It is a de Polignac number, because none of the positive numbers 2^k-19018193819 is a prime.

It is a super-2 number, since 2×19018193819² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (19018193869) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 454232 + ... + 494330.

It is an arithmetic number, because the mean of its divisors is an integer number (1624952250).

Almost surely, 2^19018193819 is an apocalyptic number.

19018193819 is a deficient number, since it is larger than the sum of its proper divisors (481233181).

19018193819 is an frugal number, since it uses more digits than its factorization.

19018193819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 40334 (or 40261 counting only the distinct ones).

The product of its (nonzero) digits is 139968, while the sum is 50.

The spelling of 19018193819 in words is "nineteen billion, eighteen million, one hundred ninety-three thousand, eight hundred nineteen".