19018043208 has 48 divisors (see below), whose sum is σ = 54537039180. Its totient is φ = 5966444544.

The previous prime is 19018043167. The next prime is 19018043221. The reversal of 19018043208 is 80234081091.

It can be written as a sum of positive squares in 2 ways, for example, as 16297586244 + 2720456964 = 127662^2 + 52158^2 .

It is a super-2 number, since 2×19018043208² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (36).

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 7767585 + ... + 7770032.

Almost surely, 2^19018043208 is an apocalyptic number.

19018043208 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

19018043208 is an abundant number, since it is smaller than the sum of its proper divisors (35518995972).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

19018043208 is a wasteful number, since it uses less digits than its factorization.

19018043208 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15537646 (or 15537639 counting only the distinct ones).

The product of its (nonzero) digits is 13824, while the sum is 36.

The spelling of 19018043208 in words is "nineteen billion, eighteen million, forty-three thousand, two hundred eight".