11554516131661 has 2 divisors, whose sum is σ = 11554516131662. Its totient is φ = 11554516131660.

The previous prime is 11554516131647. The next prime is 11554516131703. The reversal of 11554516131661 is 16613161545511.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 7176671302761 + 4377844828900 = 2678931^2 + 2092330^2 .

It is an emirp because it is prime and its reverse (16613161545511) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 11554516131661 - 2⁷ = 11554516131533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11554516131161) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5777258065830 + 5777258065831.

It is an arithmetic number, because the mean of its divisors is an integer number (5777258065831).

Almost surely, 2^{11554516131661} is an apocalyptic number.

It is an amenable number.

11554516131661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11554516131661 is an equidigital number, since it uses as much as digits as its factorization.

11554516131661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 324000, while the sum is 46.

The spelling of 11554516131661 in words is "eleven trillion, five hundred fifty-four billion, five hundred sixteen million, one hundred thirty-one thousand, six hundred sixty-one".