5518128817 has 2 divisors, whose sum is σ = 5518128818. Its totient is φ = 5518128816.

The previous prime is 5518128799. The next prime is 5518128841. The reversal of 5518128817 is 7188218155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4060110961 + 1458017856 = 63719^2 + 38184^2 .

It is a cyclic number.

It is not a de Polignac number, because 5518128817 - 2⁷ = 5518128689 is a prime.

It is not a weakly prime, because it can be changed into another prime (5518128877) 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 as a sum of consecutive naturals, namely, 2759064408 + 2759064409.

It is an arithmetic number, because the mean of its divisors is an integer number (2759064409).

Almost surely, 2^5518128817 is an apocalyptic number.

It is an amenable number.

5518128817 is a deficient number, since it is larger than the sum of its proper divisors (1).

5518128817 is an equidigital number, since it uses as much as digits as its factorization.

5518128817 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 179200, while the sum is 46.

The square root of 5518128817 is about 74284.1087783922. The cubic root of 5518128817 is about 1767.1114661002. Note that the first 3 decimals are identical.

The spelling of 5518128817 in words is "five billion, five hundred eighteen million, one hundred twenty-eight thousand, eight hundred seventeen".