78468155311181 has 2 divisors, whose sum is σ = 78468155311182. Its totient is φ = 78468155311180.

The previous prime is 78468155311099. The next prime is 78468155311207. The reversal of 78468155311181 is 18111355186487.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45246004045225 + 33222151265956 = 6726515^2 + 5763866^2 .

It is an emirp because it is prime and its reverse (18111355186487) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 78468155311181 - 2¹⁰ = 78468155310157 is a prime.

It is a super-2 number, since 2×78468155311181² (a number of 29 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 78468155311181.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78468155311981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39234077655590 + 39234077655591.

It is an arithmetic number, because the mean of its divisors is an integer number (39234077655591).

Almost surely, 2^{78468155311181} is an apocalyptic number.

It is an amenable number.

78468155311181 is a deficient number, since it is larger than the sum of its proper divisors (1).

78468155311181 is an equidigital number, since it uses as much as digits as its factorization.

78468155311181 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 6451200, while the sum is 59.

The spelling of 78468155311181 in words is "seventy-eight trillion, four hundred sixty-eight billion, one hundred fifty-five million, three hundred eleven thousand, one hundred eighty-one".