3988785997117 has 2 divisors, whose sum is σ = 3988785997118. Its totient is φ = 3988785997116.

The previous prime is 3988785997093. The next prime is 3988785997129. The reversal of 3988785997117 is 7117995878893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 3859833905316 + 128952091801 = 1964646^2 + 359099^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-3988785997117 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3988785997817) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1994392998558 + 1994392998559.

It is an arithmetic number, because the mean of its divisors is an integer number (1994392998559).

Almost surely, 2^{3988785997117} is an apocalyptic number.

It is an amenable number.

3988785997117 is a deficient number, since it is larger than the sum of its proper divisors (1).

3988785997117 is an equidigital number, since it uses as much as digits as its factorization.

3988785997117 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1920360960, while the sum is 82.

The spelling of 3988785997117 in words is "three trillion, nine hundred eighty-eight billion, seven hundred eighty-five million, nine hundred ninety-seven thousand, one hundred seventeen".