6661061056660 has 24 divisors (see below), whose sum is σ = 14811065173800. Its totient is φ = 2507693574144.

The previous prime is 6661061056621. The next prime is 6661061056697. The reversal of 6661061056660 is 666501601666.

It can be written as a sum of positive squares in 4 ways, for example, as 1055398710276 + 5605662346384 = 1027326^2 + 2367628^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 9795677685 + ... + 9795678364.

It is an arithmetic number, because the mean of its divisors is an integer number (617127715575).

Almost surely, 2^{6661061056660} is an apocalyptic number.

It is an amenable number.

6661061056660 is an abundant number, since it is smaller than the sum of its proper divisors (8150004117140).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

6661061056660 is a wasteful number, since it uses less digits than its factorization.

6661061056660 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 19591356075 (or 19591356073 counting only the distinct ones).

The product of its (nonzero) digits is 1399680, while the sum is 49.

The spelling of 6661061056660 in words is "six trillion, six hundred sixty-one billion, sixty-one million, fifty-six thousand, six hundred sixty".