3981966433792 has 20 divisors (see below), whose sum is σ = 7956155590416. Its totient is φ = 1990983216640.

The previous prime is 3981966433789. The next prime is 3981966433793. The reversal of 3981966433792 is 2973346691893.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (3981966433793) 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, 3888638584 + ... + 3888639607.

Almost surely, 2^{3981966433792} is an apocalyptic number.

3981966433792 is a gapful number since it is divisible by the number (32) formed by its first and last digit.

It is an amenable number.

3981966433792 is a deficient number, since it is larger than the sum of its proper divisors (3974189156624).

3981966433792 is an frugal number, since it uses more digits than its factorization.

3981966433792 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 7777278209 (or 7777278193 counting only the distinct ones).

The product of its digits is 317447424, while the sum is 70.

The spelling of 3981966433792 in words is "three trillion, nine hundred eighty-one billion, nine hundred sixty-six million, four hundred thirty-three thousand, seven hundred ninety-two".