7898166985939 has 2 divisors, whose sum is σ = 7898166985940. Its totient is φ = 7898166985938.

The previous prime is 7898166985937. The next prime is 7898166985993. The reversal of 7898166985939 is 9395896618987.

Together with next prime (7898166985993) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 7898166985939 - 2¹ = 7898166985937 is a prime.

Together with 7898166985937, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 7898166985939.

It is not a weakly prime, because it can be changed into another prime (7898166985931) 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, 3949083492969 + 3949083492970.

It is an arithmetic number, because the mean of its divisors is an integer number (3949083492970).

Almost surely, 2^{7898166985939} is an apocalyptic number.

7898166985939 is a deficient number, since it is larger than the sum of its proper divisors (1).

7898166985939 is an equidigital number, since it uses as much as digits as its factorization.

7898166985939 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 12697896960, while the sum is 88.

The spelling of 7898166985939 in words is "seven trillion, eight hundred ninety-eight billion, one hundred sixty-six million, nine hundred eighty-five thousand, nine hundred thirty-nine".