5555115991 has 2 divisors, whose sum is σ = 5555115992. Its totient is φ = 5555115990.

The previous prime is 5555115971. The next prime is 5555116019. The reversal of 5555115991 is 1995115555.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 5555115991 - 2¹¹ = 5555113943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5555115901) 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, 2777557995 + 2777557996.

It is an arithmetic number, because the mean of its divisors is an integer number (2777557996).

Almost surely, 2^5555115991 is an apocalyptic number.

5555115991 is a deficient number, since it is larger than the sum of its proper divisors (1).

5555115991 is an equidigital number, since it uses as much as digits as its factorization.

5555115991 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 253125, while the sum is 46.

The square root of 5555115991 is about 74532.6505029843. The cubic root of 5555115991 is about 1771.0509033682.

The spelling of 5555115991 in words is "five billion, five hundred fifty-five million, one hundred fifteen thousand, nine hundred ninety-one".