3871665666135 has 24 divisors (see below), whose sum is σ = 7064091743280. Its totient is φ = 1956210020352.

The previous prime is 3871665666131. The next prime is 3871665666149. The reversal of 3871665666135 is 5316665661783.

It is not a de Polignac number, because 3871665666135 - 2² = 3871665666131 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3871665666131) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 2264131114 + ... + 2264132823.

It is an arithmetic number, because the mean of its divisors is an integer number (294337155970).

Almost surely, 2^{3871665666135} is an apocalyptic number.

3871665666135 is a deficient number, since it is larger than the sum of its proper divisors (3192426077145).

3871665666135 is a wasteful number, since it uses less digits than its factorization.

3871665666135 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4528263967 (or 4528263964 counting only the distinct ones).

The product of its digits is 97977600, while the sum is 63.

The spelling of 3871665666135 in words is "three trillion, eight hundred seventy-one billion, six hundred sixty-five million, six hundred sixty-six thousand, one hundred thirty-five".