78108387191 has 2 divisors, whose sum is σ = 78108387192. Its totient is φ = 78108387190.

The previous prime is 78108387163. The next prime is 78108387199. The reversal of 78108387191 is 19178380187.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 78108387191 - 2¹⁴ = 78108370807 is a prime.

It is a super-2 number, since 2×78108387191² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78108387199) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39054193595 + 39054193596.

It is an arithmetic number, because the mean of its divisors is an integer number (39054193596).

Almost surely, 2^78108387191 is an apocalyptic number.

78108387191 is a deficient number, since it is larger than the sum of its proper divisors (1).

78108387191 is an equidigital number, since it uses as much as digits as its factorization.

78108387191 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 677376, while the sum is 53.

The spelling of 78108387191 in words is "seventy-eight billion, one hundred eight million, three hundred eighty-seven thousand, one hundred ninety-one".