5661606105521 has 2 divisors, whose sum is σ = 5661606105522. Its totient is φ = 5661606105520.

The previous prime is 5661606105497. The next prime is 5661606105523. The reversal of 5661606105521 is 1255016061665.

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., 5496042564496 + 165563541025 = 2344364^2 + 406895^2 .

It is a cyclic number.

It is not a de Polignac number, because 5661606105521 - 2⁶ = 5661606105457 is a prime.

Together with 5661606105523, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (5661606105523) 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, 2830803052760 + 2830803052761.

It is an arithmetic number, because the mean of its divisors is an integer number (2830803052761).

Almost surely, 2^{5661606105521} is an apocalyptic number.

It is an amenable number.

5661606105521 is a deficient number, since it is larger than the sum of its proper divisors (1).

5661606105521 is an equidigital number, since it uses as much as digits as its factorization.

5661606105521 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 324000, while the sum is 44.

The spelling of 5661606105521 in words is "five trillion, six hundred sixty-one billion, six hundred six million, one hundred five thousand, five hundred twenty-one".