6669556559666 has 288 divisors, whose sum is σ = 14819063011200. Its totient is φ = 2193986995200.

The previous prime is 6669556559663. The next prime is 6669556559681.

6669556559666 is nontrivially palindromic in base 10.

It is not an unprimeable number, because it can be changed into a prime (6669556559663) by changing a digit.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 157722446 + ... + 157764726.

It is an arithmetic number, because the mean of its divisors is an integer number (51455079900).

Almost surely, 2^{6669556559666} is an apocalyptic number.

6669556559666 is an abundant number, since it is smaller than the sum of its proper divisors (8149506451534).

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

6669556559666 is a wasteful number, since it uses less digits than its factorization.

6669556559666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42386 (or 42362 counting only the distinct ones).

The product of its digits is 14171760000, while the sum is 80.

The spelling of 6669556559666 in words is "six trillion, six hundred sixty-nine billion, five hundred fifty-six million, five hundred fifty-nine thousand, six hundred sixty-six".