78961105187 has 2 divisors, whose sum is σ = 78961105188. Its totient is φ = 78961105186.

The previous prime is 78961105159. The next prime is 78961105189. The reversal of 78961105187 is 78150116987.

It is a strong prime.

It is an emirp because it is prime and its reverse (78150116987) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78961105187 - 2¹² = 78961101091 is a prime.

It is a super-3 number, since 3×78961105187³ (a number of 34 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

Together with 78961105189, 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 (78961105189) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39480552593 + 39480552594.

It is an arithmetic number, because the mean of its divisors is an integer number (39480552594).

Almost surely, 2^78961105187 is an apocalyptic number.

78961105187 is a deficient number, since it is larger than the sum of its proper divisors (1).

78961105187 is an equidigital number, since it uses as much as digits as its factorization.

78961105187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 846720, while the sum is 53.

The spelling of 78961105187 in words is "seventy-eight billion, nine hundred sixty-one million, one hundred five thousand, one hundred eighty-seven".