5605556116661 has 4 divisors (see below), whose sum is σ = 5636872072800. Its totient is φ = 5574240160524.

The previous prime is 5605556116639. The next prime is 5605556116673. The reversal of 5605556116661 is 1666116555065.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 5605556116661 - 2³⁴ = 5588376247477 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5605556116631) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 15657977801 + ... + 15657978158.

It is an arithmetic number, because the mean of its divisors is an integer number (1409218018200).

Almost surely, 2^{5605556116661} is an apocalyptic number.

It is an amenable number.

5605556116661 is a deficient number, since it is larger than the sum of its proper divisors (31315956139).

5605556116661 is a wasteful number, since it uses less digits than its factorization.

5605556116661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 31315956138.

The product of its (nonzero) digits is 4860000, while the sum is 53.

The spelling of 5605556116661 in words is "five trillion, six hundred five billion, five hundred fifty-six million, one hundred sixteen thousand, six hundred sixty-one".