3947789391659 has 2 divisors, whose sum is σ = 3947789391660. Its totient is φ = 3947789391658.

The previous prime is 3947789391653. The next prime is 3947789391661. The reversal of 3947789391659 is 9561939877493.

It is a strong prime.

It is an emirp because it is prime and its reverse (9561939877493) is a distict prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3947789391659 is a prime.

Together with 3947789391661, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (3947789391653) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1973894695829 + 1973894695830.

It is an arithmetic number, because the mean of its divisors is an integer number (1973894695830).

Almost surely, 2^{3947789391659} is an apocalyptic number.

3947789391659 is a deficient number, since it is larger than the sum of its proper divisors (1).

3947789391659 is an equidigital number, since it uses as much as digits as its factorization.

3947789391659 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2777664960, while the sum is 80.

The spelling of 3947789391659 in words is "three trillion, nine hundred forty-seven billion, seven hundred eighty-nine million, three hundred ninety-one thousand, six hundred fifty-nine".