6661443147743 has 4 divisors (see below), whose sum is σ = 6662090591520. Its totient is φ = 6660795703968.

The previous prime is 6661443147739. The next prime is 6661443147773. The reversal of 6661443147743 is 3477413441666.

6661443147743 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 6661443147743 - 2² = 6661443147739 is a prime.

It is a super-2 number, since 2×6661443147743² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6661443147773) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 323706455 + ... + 323727032.

It is an arithmetic number, because the mean of its divisors is an integer number (1665522647880).

Almost surely, 2^{6661443147743} is an apocalyptic number.

6661443147743 is a deficient number, since it is larger than the sum of its proper divisors (647443777).

6661443147743 is a wasteful number, since it uses less digits than its factorization.

6661443147743 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 647443776.

The product of its digits is 24385536, while the sum is 56.

The spelling of 6661443147743 in words is "six trillion, six hundred sixty-one billion, four hundred forty-three million, one hundred forty-seven thousand, seven hundred forty-three".