5505550510661 has 2 divisors, whose sum is σ = 5505550510662. Its totient is φ = 5505550510660.

The previous prime is 5505550510597. The next prime is 5505550510673. The reversal of 5505550510661 is 1660150555055.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4028875926436 + 1476674584225 = 2007206^2 + 1215185^2 .

It is a cyclic number.

It is not a de Polignac number, because 5505550510661 - 2⁶ = 5505550510597 is a prime.

It is a super-2 number, since 2×5505550510661² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5505550510261) 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, 2752775255330 + 2752775255331.

It is an arithmetic number, because the mean of its divisors is an integer number (2752775255331).

Almost surely, 2^{5505550510661} is an apocalyptic number.

It is an amenable number.

5505550510661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5505550510661 is an equidigital number, since it uses as much as digits as its factorization.

5505550510661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 562500, while the sum is 44.

The spelling of 5505550510661 in words is "five trillion, five hundred five billion, five hundred fifty million, five hundred ten thousand, six hundred sixty-one".