16618128512 has 32 divisors (see below), whose sum is σ = 33147557100. Its totient is φ = 8298741760.

The previous prime is 16618128511. The next prime is 16618128529. The reversal of 16618128512 is 21582181661.

It can be written as a sum of positive squares in 2 ways, for example, as 16595622976 + 22505536 = 128824^2 + 4744^2 .

It is a tau number, because it is divible by the number of its divisors (32).

It is a self number, because there is not a number n which added to its sum of digits gives 16618128512.

It is not an unprimeable number, because it can be changed into a prime (16618128511) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 23312 + ... + 183792.

Almost surely, 2^16618128512 is an apocalyptic number.

It is an amenable number.

16618128512 is a deficient number, since it is larger than the sum of its proper divisors (16529428588).

16618128512 is an equidigital number, since it uses as much as digits as its factorization.

16618128512 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 161304 (or 161292 counting only the distinct ones).

The product of its digits is 46080, while the sum is 41.

The spelling of 16618128512 in words is "sixteen billion, six hundred eighteen million, one hundred twenty-eight thousand, five hundred twelve".