3998664587249 has 2 divisors, whose sum is σ = 3998664587250. Its totient is φ = 3998664587248.

The previous prime is 3998664587213. The next prime is 3998664587263. The reversal of 3998664587249 is 9427854668993.

3998664587249 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3392669286400 + 605995300849 = 1841920^2 + 778457^2 .

It is a cyclic number.

It is not a de Polignac number, because 3998664587249 - 2²⁰ = 3998663538673 is a prime.

It is not a weakly prime, because it can be changed into another prime (3998664587299) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1999332293624 + 1999332293625.

It is an arithmetic number, because the mean of its divisors is an integer number (1999332293625).

Almost surely, 2^{3998664587249} is an apocalyptic number.

It is an amenable number.

3998664587249 is a deficient number, since it is larger than the sum of its proper divisors (1).

3998664587249 is an equidigital number, since it uses as much as digits as its factorization.

3998664587249 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 5643509760, while the sum is 80.

The spelling of 3998664587249 in words is "three trillion, nine hundred ninety-eight billion, six hundred sixty-four million, five hundred eighty-seven thousand, two hundred forty-nine".