38987797661849 has 2 divisors, whose sum is σ = 38987797661850. Its totient is φ = 38987797661848.

The previous prime is 38987797661809. The next prime is 38987797661851. The reversal of 38987797661849 is 94816679778983.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 20777478965824 + 18210318696025 = 4558232^2 + 4267355^2 .

It is an emirp because it is prime and its reverse (94816679778983) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38987797661849 - 2⁴⁰ = 37888286034073 is a prime.

Together with 38987797661851, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (38987797661809) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19493898830924 + 19493898830925.

It is an arithmetic number, because the mean of its divisors is an integer number (19493898830925).

Almost surely, 2^{38987797661849} is an apocalyptic number.

It is an amenable number.

38987797661849 is a deficient number, since it is larger than the sum of its proper divisors (1).

38987797661849 is an equidigital number, since it uses as much as digits as its factorization.

38987797661849 is an evil number, because the sum of its binary digits is even.

The product of its digits is 55306395648, while the sum is 92.

The spelling of 38987797661849 in words is "thirty-eight trillion, nine hundred eighty-seven billion, seven hundred ninety-seven million, six hundred sixty-one thousand, eight hundred forty-nine".