3851688866881 has 4 divisors (see below), whose sum is σ = 3887025462100. Its totient is φ = 3816352271664.

The previous prime is 3851688866873. The next prime is 3851688866887. The reversal of 3851688866881 is 1886688861583.

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 3253726908481 + 597961958400 = 1803809^2 + 773280^2 .

It is a cyclic number.

It is not a de Polignac number, because 3851688866881 - 2³ = 3851688866873 is a prime.

It is a super-2 number, since 2×3851688866881² (a number of 26 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 3851688866798 and 3851688866807.

It is not an unprimeable number, because it can be changed into a prime (3851688866887) 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, 17668297446 + ... + 17668297663.

It is an arithmetic number, because the mean of its divisors is an integer number (971756365525).

Almost surely, 2^{3851688866881} is an apocalyptic number.

It is an amenable number.

3851688866881 is a deficient number, since it is larger than the sum of its proper divisors (35336595219).

3851688866881 is a wasteful number, since it uses less digits than its factorization.

3851688866881 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35336595218.

The product of its digits is 849346560, while the sum is 76.

The spelling of 3851688866881 in words is "three trillion, eight hundred fifty-one billion, six hundred eighty-eight million, eight hundred sixty-six thousand, eight hundred eighty-one".