3988817697517 has 2 divisors, whose sum is σ = 3988817697518. Its totient is φ = 3988817697516.

The previous prime is 3988817697463. The next prime is 3988817697559. The reversal of 3988817697517 is 7157967188893.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2949826860036 + 1038990837481 = 1717506^2 + 1019309^2 .

It is an emirp because it is prime and its reverse (7157967188893) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 3988817697517 - 2²⁷ = 3988683479789 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (3988817697587) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1994408848758 + 1994408848759.

It is an arithmetic number, because the mean of its divisors is an integer number (1994408848759).

Almost surely, 2^{3988817697517} is an apocalyptic number.

It is an amenable number.

3988817697517 is a deficient number, since it is larger than the sum of its proper divisors (1).

3988817697517 is an equidigital number, since it uses as much as digits as its factorization.

3988817697517 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1280240640, while the sum is 79.

The spelling of 3988817697517 in words is "three trillion, nine hundred eighty-eight billion, eight hundred seventeen million, six hundred ninety-seven thousand, five hundred seventeen".