6566888670661 has 8 divisors (see below), whose sum is σ = 7164971849664. Its totient is φ = 5968987708320.

The previous prime is 6566888670659. The next prime is 6566888670673. The reversal of 6566888670661 is 1660768886656.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 6566888670661 - 2¹ = 6566888670659 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 (6566888670631) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 45478801 + ... + 45622966.

It is an arithmetic number, because the mean of its divisors is an integer number (895621481208).

Almost surely, 2^{6566888670661} is an apocalyptic number.

It is an amenable number.

6566888670661 is a deficient number, since it is larger than the sum of its proper divisors (598083179003).

6566888670661 is a wasteful number, since it uses less digits than its factorization.

6566888670661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 91108331.

The product of its (nonzero) digits is 836075520, while the sum is 73.

The spelling of 6566888670661 in words is "six trillion, five hundred sixty-six billion, eight hundred eighty-eight million, six hundred seventy thousand, six hundred sixty-one".