3781967118871 has 2 divisors, whose sum is σ = 3781967118872. Its totient is φ = 3781967118870.

The previous prime is 3781967118767. The next prime is 3781967118911. The reversal of 3781967118871 is 1788117691873.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3781967118871 - 2¹⁹ = 3781966594583 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 3781967118797 and 3781967118806.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3781967118071) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1890983559435 + 1890983559436.

It is an arithmetic number, because the mean of its divisors is an integer number (1890983559436).

Almost surely, 2^{3781967118871} is an apocalyptic number.

3781967118871 is a deficient number, since it is larger than the sum of its proper divisors (1).

3781967118871 is an equidigital number, since it uses as much as digits as its factorization.

3781967118871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 28449792, while the sum is 67.

The spelling of 3781967118871 in words is "three trillion, seven hundred eighty-one billion, nine hundred sixty-seven million, one hundred eighteen thousand, eight hundred seventy-one".