3871661884345 has 8 divisors (see below), whose sum is σ = 4647786021576. Its totient is φ = 3096135000576.

The previous prime is 3871661884333. The next prime is 3871661884399. The reversal of 3871661884345 is 5434881661783.

It can be written as a sum of positive squares in 4 ways, for example, as 132342436521 + 3739319447824 = 363789^2 + 1933732^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 3871661884345 - 2¹⁹ = 3871661360057 is a prime.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 149299102 + ... + 149325031.

It is an arithmetic number, because the mean of its divisors is an integer number (580973252697).

Almost surely, 2^{3871661884345} is an apocalyptic number.

It is an amenable number.

3871661884345 is a deficient number, since it is larger than the sum of its proper divisors (776124137231).

3871661884345 is a wasteful number, since it uses less digits than its factorization.

3871661884345 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 298626731.

The product of its digits is 92897280, while the sum is 64.

The spelling of 3871661884345 in words is "three trillion, eight hundred seventy-one billion, six hundred sixty-one million, eight hundred eighty-four thousand, three hundred forty-five".