3991163394004 has 6 divisors (see below), whose sum is σ = 6984535939514. Its totient is φ = 1995581697000.

The previous prime is 3991163393989. The next prime is 3991163394011. The reversal of 3991163394004 is 4004933611993.

It can be written as a sum of positive squares in only one way, i.e., 3714485290000 + 276678104004 = 1927300^2 + 526002^2 .

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 498895424247 + ... + 498895424254.

Almost surely, 2^{3991163394004} is an apocalyptic number.

It is an amenable number.

3991163394004 is a deficient number, since it is larger than the sum of its proper divisors (2993372545510).

3991163394004 is a wasteful number, since it uses less digits than its factorization.

3991163394004 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 997790848505 (or 997790848503 counting only the distinct ones).

The product of its (nonzero) digits is 1889568, while the sum is 52.

The spelling of 3991163394004 in words is "three trillion, nine hundred ninety-one billion, one hundred sixty-three million, three hundred ninety-four thousand, four".