3945886191887 has 2 divisors, whose sum is σ = 3945886191888. Its totient is φ = 3945886191886.

The previous prime is 3945886191883. The next prime is 3945886191889. The reversal of 3945886191887 is 7881916885493.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3945886191887 - 2² = 3945886191883 is a prime.

Together with 3945886191889, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3945886191883) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1972943095943 + 1972943095944.

It is an arithmetic number, because the mean of its divisors is an integer number (1972943095944).

Almost surely, 2^{3945886191887} is an apocalyptic number.

3945886191887 is a deficient number, since it is larger than the sum of its proper divisors (1).

3945886191887 is an equidigital number, since it uses as much as digits as its factorization.

3945886191887 is an evil number, because the sum of its binary digits is even.

The product of its digits is 836075520, while the sum is 77.

The spelling of 3945886191887 in words is "three trillion, nine hundred forty-five billion, eight hundred eighty-six million, one hundred ninety-one thousand, eight hundred eighty-seven".