3981966433793 has 2 divisors, whose sum is σ = 3981966433794. Its totient is φ = 3981966433792.

The previous prime is 3981966433789. The next prime is 3981966433831. The reversal of 3981966433793 is 3973346691893.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 3508323794704 + 473642639089 = 1873052^2 + 688217^2 .

It is an emirp because it is prime and its reverse (3973346691893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3981966433793 - 2² = 3981966433789 is a prime.

It is not a weakly prime, because it can be changed into another prime (3981960433793) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1990983216896 + 1990983216897.

It is an arithmetic number, because the mean of its divisors is an integer number (1990983216897).

Almost surely, 2^{3981966433793} is an apocalyptic number.

It is an amenable number.

3981966433793 is a deficient number, since it is larger than the sum of its proper divisors (1).

3981966433793 is an equidigital number, since it uses as much as digits as its factorization.

3981966433793 is an evil number, because the sum of its binary digits is even.

The product of its digits is 476171136, while the sum is 71.

The spelling of 3981966433793 in words is "three trillion, nine hundred eighty-one billion, nine hundred sixty-six million, four hundred thirty-three thousand, seven hundred ninety-three".