78110678110891 has 2 divisors, whose sum is σ = 78110678110892. Its totient is φ = 78110678110890.

The previous prime is 78110678110877. The next prime is 78110678110937. The reversal of 78110678110891 is 19801187601187.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 78110678110891 - 2¹⁵ = 78110678078123 is a prime.

It is a super-2 number, since 2×78110678110891² (a number of 29 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (78110678110811) 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, 39055339055445 + 39055339055446.

It is an arithmetic number, because the mean of its divisors is an integer number (39055339055446).

Almost surely, 2^{78110678110891} is an apocalyptic number.

78110678110891 is a deficient number, since it is larger than the sum of its proper divisors (1).

78110678110891 is an equidigital number, since it uses as much as digits as its factorization.

78110678110891 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1354752, while the sum is 58.

The spelling of 78110678110891 in words is "seventy-eight trillion, one hundred ten billion, six hundred seventy-eight million, one hundred ten thousand, eight hundred ninety-one".