38391618871 has 2 divisors, whose sum is σ = 38391618872. Its totient is φ = 38391618870.

The previous prime is 38391618869. The next prime is 38391618887. The reversal of 38391618871 is 17881619383.

It is a happy number.

38391618871 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is an emirp because it is prime and its reverse (17881619383) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 38391618871 - 2¹ = 38391618869 is a prime.

It is a super-2 number, since 2×38391618871² (a number of 22 digits) contains 22 as substring.

Together with 38391618869, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (38391618821) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19195809435 + 19195809436.

It is an arithmetic number, because the mean of its divisors is an integer number (19195809436).

Almost surely, 2^38391618871 is an apocalyptic number.

38391618871 is a deficient number, since it is larger than the sum of its proper divisors (1).

38391618871 is an equidigital number, since it uses as much as digits as its factorization.

38391618871 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1741824, while the sum is 55.

The spelling of 38391618871 in words is "thirty-eight billion, three hundred ninety-one million, six hundred eighteen thousand, eight hundred seventy-one".