6660644404242 has 32 divisors (see below), whose sum is σ = 13553343812160. Its totient is φ = 2181573803520.

The previous prime is 6660644404217. The next prime is 6660644404331. The reversal of 6660644404242 is 2424044460666.

It is a junction number, because it is equal to n+sod(n) for n = 6660644404191 and 6660644404200.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 3588403 + ... + 5118390.

It is an arithmetic number, because the mean of its divisors is an integer number (423541994130).

Almost surely, 2^{6660644404242} is an apocalyptic number.

6660644404242 is an abundant number, since it is smaller than the sum of its proper divisors (6892699407918).

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

6660644404242 is a wasteful number, since it uses less digits than its factorization.

6660644404242 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8709018.

The product of its (nonzero) digits is 5308416, while the sum is 48.

The spelling of 6660644404242 in words is "six trillion, six hundred sixty billion, six hundred forty-four million, four hundred four thousand, two hundred forty-two".