3999991878703 has 2 divisors, whose sum is σ = 3999991878704. Its totient is φ = 3999991878702.

The previous prime is 3999991878683. The next prime is 3999991878709. The reversal of 3999991878703 is 3078781999993.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 3999991878703 - 2³³ = 3991401944111 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3999991878709) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999995939351 + 1999995939352.

It is an arithmetic number, because the mean of its divisors is an integer number (1999995939352).

Almost surely, 2^{3999991878703} is an apocalyptic number.

3999991878703 is a deficient number, since it is larger than the sum of its proper divisors (1).

3999991878703 is an equidigital number, since it uses as much as digits as its factorization.

3999991878703 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1666598976, while the sum is 82.

The spelling of 3999991878703 in words is "three trillion, nine hundred ninety-nine billion, nine hundred ninety-one million, eight hundred seventy-eight thousand, seven hundred three".