3994805460871 has 2 divisors, whose sum is σ = 3994805460872. Its totient is φ = 3994805460870.

The previous prime is 3994805460869. The next prime is 3994805460887. The reversal of 3994805460871 is 1780645084993.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 3994805460871 - 2¹ = 3994805460869 is a prime.

Together with 3994805460869, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3994805460071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1997402730435 + 1997402730436.

It is an arithmetic number, because the mean of its divisors is an integer number (1997402730436).

Almost surely, 2^{3994805460871} is an apocalyptic number.

3994805460871 is a deficient number, since it is larger than the sum of its proper divisors (1).

3994805460871 is an equidigital number, since it uses as much as digits as its factorization.

3994805460871 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 52254720, while the sum is 64.

The spelling of 3994805460871 in words is "three trillion, nine hundred ninety-four billion, eight hundred five million, four hundred sixty thousand, eight hundred seventy-one".