3998664587747 has 4 divisors (see below), whose sum is σ = 3999118835400. Its totient is φ = 3998210340096.

The previous prime is 3998664587713. The next prime is 3998664587761. The reversal of 3998664587747 is 7477854668993.

3998664587747 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 3998664587747 - 2³⁰ = 3997590845923 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (3998664583747) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 227110622 + ... + 227128227.

It is an arithmetic number, because the mean of its divisors is an integer number (999779708850).

Almost surely, 2^{3998664587747} is an apocalyptic number.

3998664587747 is a deficient number, since it is larger than the sum of its proper divisors (454247653).

3998664587747 is an equidigital number, since it uses as much as digits as its factorization.

3998664587747 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 454247652.

The product of its digits is 15362887680, while the sum is 83.

The spelling of 3998664587747 in words is "three trillion, nine hundred ninety-eight billion, six hundred sixty-four million, five hundred eighty-seven thousand, seven hundred forty-seven".