38987797663897 has 2 divisors, whose sum is σ = 38987797663898. Its totient is φ = 38987797663896.

The previous prime is 38987797663847. The next prime is 38987797663901. The reversal of 38987797663897 is 79836679778983.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 36120292320256 + 2867505343641 = 6010016^2 + 1693371^2 .

It is a cyclic number.

It is not a de Polignac number, because 38987797663897 - 2¹¹ = 38987797661849 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 38987797663799 and 38987797663808.

It is not a weakly prime, because it can be changed into another prime (38987797663847) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19493898831948 + 19493898831949.

It is an arithmetic number, because the mean of its divisors is an integer number (19493898831949).

Almost surely, 2^{38987797663897} is an apocalyptic number.

It is an amenable number.

38987797663897 is a deficient number, since it is larger than the sum of its proper divisors (1).

38987797663897 is an equidigital number, since it uses as much as digits as its factorization.

38987797663897 is an evil number, because the sum of its binary digits is even.

The product of its digits is 290358577152, while the sum is 97.

The spelling of 38987797663897 in words is "thirty-eight trillion, nine hundred eighty-seven billion, seven hundred ninety-seven million, six hundred sixty-three thousand, eight hundred ninety-seven".