3871438455681 has 6 divisors (see below), whose sum is σ = 5592077769330. Its totient is φ = 2580958970448.

The previous prime is 3871438455679. The next prime is 3871438455721. The reversal of 3871438455681 is 1865548341783.

It is a happy number.

3871438455681 is a `hidden beast` number, since 3 + 8 + 71 + 4 + 3 + 8 + 4 + 556 + 8 + 1 = 666.

It can be written as a sum of positive squares in only one way, i.e., 3839973372225 + 31465083456 = 1959585^2 + 177384^2 .

It is not a de Polignac number, because 3871438455681 - 2¹ = 3871438455679 is a prime.

It is a super-2 number, since 2×3871438455681² (a number of 26 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (3871438455581) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 215079914196 + ... + 215079914213.

It is an arithmetic number, because the mean of its divisors is an integer number (932012961555).

Almost surely, 2^{3871438455681} is an apocalyptic number.

It is an amenable number.

3871438455681 is a deficient number, since it is larger than the sum of its proper divisors (1720639313649).

3871438455681 is a wasteful number, since it uses less digits than its factorization.

3871438455681 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430159828415 (or 430159828412 counting only the distinct ones).

The product of its digits is 77414400, while the sum is 63.

The spelling of 3871438455681 in words is "three trillion, eight hundred seventy-one billion, four hundred thirty-eight million, four hundred fifty-five thousand, six hundred eighty-one".