1116661005557 has 2 divisors, whose sum is σ = 1116661005558. Its totient is φ = 1116661005556.

The previous prime is 1116661005461. The next prime is 1116661005571. The reversal of 1116661005557 is 7555001666111.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1051268798596 + 65392206961 = 1025314^2 + 255719^2 .

It is an emirp because it is prime and its reverse (7555001666111) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1116661005557 - 2⁸ = 1116661005301 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1116661065557) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 558330502778 + 558330502779.

It is an arithmetic number, because the mean of its divisors is an integer number (558330502779).

Almost surely, 2^{1116661005557} is an apocalyptic number.

It is an amenable number.

1116661005557 is a deficient number, since it is larger than the sum of its proper divisors (1).

1116661005557 is an equidigital number, since it uses as much as digits as its factorization.

1116661005557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 189000, while the sum is 44.

The spelling of 1116661005557 in words is "one trillion, one hundred sixteen billion, six hundred sixty-one million, five thousand, five hundred fifty-seven".