16618128529 has 2 divisors, whose sum is σ = 16618128530. Its totient is φ = 16618128528.

The previous prime is 16618128511. The next prime is 16618128559. The reversal of 16618128529 is 92582181661.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 15314557504 + 1303571025 = 123752^2 + 36105^2 .

It is a cyclic number.

It is not a de Polignac number, because 16618128529 - 2⁵ = 16618128497 is a prime.

It is not a weakly prime, because it can be changed into another prime (16618128509) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 8309064264 + 8309064265.

It is an arithmetic number, because the mean of its divisors is an integer number (8309064265).

Almost surely, 2^16618128529 is an apocalyptic number.

It is an amenable number.

16618128529 is a deficient number, since it is larger than the sum of its proper divisors (1).

16618128529 is an equidigital number, since it uses as much as digits as its factorization.

16618128529 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 414720, while the sum is 49.

The spelling of 16618128529 in words is "sixteen billion, six hundred eighteen million, one hundred twenty-eight thousand, five hundred twenty-nine".