5605601511661 has 2 divisors, whose sum is σ = 5605601511662. Its totient is φ = 5605601511660.

The previous prime is 5605601511623. The next prime is 5605601511673. The reversal of 5605601511661 is 1661151065065.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2871903019561 + 2733698492100 = 1694669^2 + 1653390^2 .

It is a cyclic number.

It is not a de Polignac number, because 5605601511661 - 2⁹ = 5605601511149 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (5605601511611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2802800755830 + 2802800755831.

It is an arithmetic number, because the mean of its divisors is an integer number (2802800755831).

Almost surely, 2^{5605601511661} is an apocalyptic number.

It is an amenable number.

5605601511661 is a deficient number, since it is larger than the sum of its proper divisors (1).

5605601511661 is an equidigital number, since it uses as much as digits as its factorization.

5605601511661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 162000, while the sum is 43.

The spelling of 5605601511661 in words is "five trillion, six hundred five billion, six hundred one million, five hundred eleven thousand, six hundred sixty-one".