6661443147742 has 16 divisors (see below), whose sum is σ = 10592002949040. Its totient is φ = 3131222306688.

The previous prime is 6661443147739. The next prime is 6661443147773. The reversal of 6661443147742 is 2477413441666.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 111671892 + ... + 111731527.

It is an arithmetic number, because the mean of its divisors is an integer number (662000184315).

Almost surely, 2^{6661443147742} is an apocalyptic number.

6661443147742 is a deficient number, since it is larger than the sum of its proper divisors (3930559801298).

6661443147742 is a wasteful number, since it uses less digits than its factorization.

6661443147742 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 223404315.

The product of its digits is 16257024, while the sum is 55.

The spelling of 6661443147742 in words is "six trillion, six hundred sixty-one billion, four hundred forty-three million, one hundred forty-seven thousand, seven hundred forty-two".