19072216818 has 54 divisors (see below), whose sum is σ = 42362449389. Its totient is φ = 6201356112.

The previous prime is 19072216817. The next prime is 19072216841. The reversal of 19072216818 is 81861227091.

It can be written as a sum of positive squares in 2 ways, for example, as 18803814129 + 268402689 = 137127^2 + 16383^2 .

It is an ABA number since it can be written as A⋅B^A, here for A=2, B=97653.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19072216817) 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 26 ways as a sum of consecutive naturals, for example, 25194096 + ... + 25194852.

Almost surely, 2^19072216818 is an apocalyptic number.

19072216818 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

19072216818 is an abundant number, since it is smaller than the sum of its proper divisors (23290232571).

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

19072216818 is an frugal number, since it uses more digits than its factorization.

19072216818 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1608 (or 805 counting only the distinct ones).

The product of its (nonzero) digits is 96768, while the sum is 45.

The spelling of 19072216818 in words is "nineteen billion, seventy-two million, two hundred sixteen thousand, eight hundred eighteen".