5611556000661 has 32 divisors (see below), whose sum is σ = 8067829174272. Its totient is φ = 3448891120320.

The previous prime is 5611556000651. The next prime is 5611556000741. The reversal of 5611556000661 is 1660006551165.

It is not a de Polignac number, because 5611556000661 - 2⁵ = 5611556000629 is a prime.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (5611556000621) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 185656596 + ... + 185686818.

It is an arithmetic number, because the mean of its divisors is an integer number (252119661696).

Almost surely, 2^{5611556000661} is an apocalyptic number.

It is an amenable number.

5611556000661 is a deficient number, since it is larger than the sum of its proper divisors (2456273173611).

5611556000661 is a wasteful number, since it uses less digits than its factorization.

5611556000661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 36113.

The product of its (nonzero) digits is 162000, while the sum is 42.

The spelling of 5611556000661 in words is "five trillion, six hundred eleven billion, five hundred fifty-six million, six hundred sixty-one", and thus it is an aban number.