78881467744109 has 2 divisors, whose sum is σ = 78881467744110. Its totient is φ = 78881467744108.

The previous prime is 78881467744049. The next prime is 78881467744153. The reversal of 78881467744109 is 90144776418887.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 71010199830025 + 7871267914084 = 8426755^2 + 2805578^2 .

It is a cyclic number.

It is not a de Polignac number, because 78881467744109 - 2²⁰ = 78881466695533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78881467740109) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39440733872054 + 39440733872055.

It is an arithmetic number, because the mean of its divisors is an integer number (39440733872055).

Almost surely, 2^{78881467744109} is an apocalyptic number.

It is an amenable number.

78881467744109 is a deficient number, since it is larger than the sum of its proper divisors (1).

78881467744109 is an equidigital number, since it uses as much as digits as its factorization.

78881467744109 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 606928896, while the sum is 74.

The spelling of 78881467744109 in words is "seventy-eight trillion, eight hundred eighty-one billion, four hundred sixty-seven million, seven hundred forty-four thousand, one hundred nine".