3666681467789 has 4 divisors (see below), whose sum is σ = 3700320747420. Its totient is φ = 3633042188160.

The previous prime is 3666681467719. The next prime is 3666681467821. The reversal of 3666681467789 is 9877641866663.

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

It can be written as a sum of positive squares in 2 ways, for example, as 1029987503689 + 2636693964100 = 1014883^2 + 1623790^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3666681467789 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 (3666681467719) 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, 16819639652 + ... + 16819639869.

It is an arithmetic number, because the mean of its divisors is an integer number (925080186855).

Almost surely, 2^{3666681467789} is an apocalyptic number.

It is an amenable number.

3666681467789 is a deficient number, since it is larger than the sum of its proper divisors (33639279631).

3666681467789 is a wasteful number, since it uses less digits than its factorization.

3666681467789 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 33639279630.

The product of its digits is 2633637888, while the sum is 77.

The spelling of 3666681467789 in words is "three trillion, six hundred sixty-six billion, six hundred eighty-one million, four hundred sixty-seven thousand, seven hundred eighty-nine".