1116661005661 has 32 divisors (see below), whose sum is σ = 1189300050432. Its totient is φ = 1046274873600.

The previous prime is 1116661005643. The next prime is 1116661005689. The reversal of 1116661005661 is 1665001666111.

It is a cyclic number.

It is not a de Polignac number, because 1116661005661 - 2¹⁵ = 1116660972893 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (1116661005611) 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, 414651831 + ... + 414654523.

It is an arithmetic number, because the mean of its divisors is an integer number (37165626576).

Almost surely, 2^{1116661005661} is an apocalyptic number.

It is an amenable number.

1116661005661 is a deficient number, since it is larger than the sum of its proper divisors (72639044771).

1116661005661 is a wasteful number, since it uses less digits than its factorization.

1116661005661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4653.

The product of its (nonzero) digits is 38880, while the sum is 40.

The spelling of 1116661005661 in words is "one trillion, one hundred sixteen billion, six hundred sixty-one million, five thousand, six hundred sixty-one".