55658776661 has 2 divisors, whose sum is σ = 55658776662. Its totient is φ = 55658776660.

The previous prime is 55658776633. The next prime is 55658776687. The reversal of 55658776661 is 16667785655.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45033084100 + 10625692561 = 212210^2 + 103081^2 .

It is a cyclic number.

It is not a de Polignac number, because 55658776661 - 2¹⁰ = 55658775637 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 55658776594 and 55658776603.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55658776961) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 27829388330 + 27829388331.

It is an arithmetic number, because the mean of its divisors is an integer number (27829388331).

Almost surely, 2^55658776661 is an apocalyptic number.

It is an amenable number.

55658776661 is a deficient number, since it is larger than the sum of its proper divisors (1).

55658776661 is an equidigital number, since it uses as much as digits as its factorization.

55658776661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 63504000, while the sum is 62.

The spelling of 55658776661 in words is "fifty-five billion, six hundred fifty-eight million, seven hundred seventy-six thousand, six hundred sixty-one".