5515661155489 has 2 divisors, whose sum is σ = 5515661155490. Its totient is φ = 5515661155488.

The previous prime is 5515661155457. The next prime is 5515661155549. The reversal of 5515661155489 is 9845511665155.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3767403360400 + 1748257795089 = 1940980^2 + 1322217^2 .

It is a cyclic number.

It is not a de Polignac number, because 5515661155489 - 2⁵ = 5515661155457 is a prime.

It is not a weakly prime, because it can be changed into another prime (5515661155189) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2757830577744 + 2757830577745.

It is an arithmetic number, because the mean of its divisors is an integer number (2757830577745).

Almost surely, 2^{5515661155489} is an apocalyptic number.

It is an amenable number.

5515661155489 is a deficient number, since it is larger than the sum of its proper divisors (1).

5515661155489 is an equidigital number, since it uses as much as digits as its factorization.

5515661155489 is an evil number, because the sum of its binary digits is even.

The product of its digits is 32400000, while the sum is 61.

The spelling of 5515661155489 in words is "five trillion, five hundred fifteen billion, six hundred sixty-one million, one hundred fifty-five thousand, four hundred eighty-nine".