6660061115661 has 24 divisors (see below), whose sum is σ = 9681374888640. Its totient is φ = 4411774844736.

The previous prime is 6660061115633. The next prime is 6660061115711. The reversal of 6660061115661 is 1665111600666.

It is not a de Polignac number, because 6660061115661 - 2³⁹ = 6110305301773 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 (6660061119661) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3115930 + ... + 4798868.

It is an arithmetic number, because the mean of its divisors is an integer number (403390620360).

Almost surely, 2^{6660061115661} is an apocalyptic number.

It is an amenable number.

6660061115661 is a deficient number, since it is larger than the sum of its proper divisors (3021313772979).

6660061115661 is a wasteful number, since it uses less digits than its factorization.

6660061115661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1685745 (or 1685742 counting only the distinct ones).

The product of its (nonzero) digits is 233280, while the sum is 45.

The spelling of 6660061115661 in words is "six trillion, six hundred sixty billion, sixty-one million, one hundred fifteen thousand, six hundred sixty-one".