3991163394011 has 2 divisors, whose sum is σ = 3991163394012. Its totient is φ = 3991163394010.

The previous prime is 3991163393989. The next prime is 3991163394079. The reversal of 3991163394011 is 1104933611993.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3991163394011 is a prime.

It is not a weakly prime, because it can be changed into another prime (3991163391011) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1995581697005 + 1995581697006.

It is an arithmetic number, because the mean of its divisors is an integer number (1995581697006).

Almost surely, 2^{3991163394011} is an apocalyptic number.

3991163394011 is a deficient number, since it is larger than the sum of its proper divisors (1).

3991163394011 is an equidigital number, since it uses as much as digits as its factorization.

3991163394011 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 472392, while the sum is 50.

The spelling of 3991163394011 in words is "three trillion, nine hundred ninety-one billion, one hundred sixty-three million, three hundred ninety-four thousand, eleven".