19066800128 has 24 divisors (see below), whose sum is σ = 38124294390. Its totient is φ = 9533399040.

The previous prime is 19066800121. The next prime is 19066800161. The reversal of 19066800128 is 82100866091.

It can be written as a sum of positive squares in only one way, i.e., 19013100544 + 53699584 = 137888^2 + 7328^2 .

It is a super-2 number, since 2×19066800128² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (19066800121) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4652933 + ... + 4657028.

Almost surely, 2^19066800128 is an apocalyptic number.

It is an amenable number.

19066800128 is a deficient number, since it is larger than the sum of its proper divisors (19057494262).

19066800128 is an frugal number, since it uses more digits than its factorization.

19066800128 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9309983 (or 9309963 counting only the distinct ones).

The product of its (nonzero) digits is 41472, while the sum is 41.

The spelling of 19066800128 in words is "nineteen billion, sixty-six million, eight hundred thousand, one hundred twenty-eight".