78111027361 has 2 divisors, whose sum is σ = 78111027362. Its totient is φ = 78111027360.

The previous prime is 78111027359. The next prime is 78111027383. The reversal of 78111027361 is 16372011187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 43754180625 + 34356846736 = 209175^2 + 185356^2 .

It is a cyclic number.

It is not a de Polignac number, because 78111027361 - 2¹ = 78111027359 is a prime.

It is a super-2 number, since 2×78111027361² (a number of 23 digits) contains 22 as substring.

Together with 78111027359, it forms a pair of twin primes.

It is a self number, because there is not a number n which added to its sum of digits gives 78111027361.

It is not a weakly prime, because it can be changed into another prime (78111027461) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39055513680 + 39055513681.

It is an arithmetic number, because the mean of its divisors is an integer number (39055513681).

Almost surely, 2^78111027361 is an apocalyptic number.

It is an amenable number.

78111027361 is a deficient number, since it is larger than the sum of its proper divisors (1).

78111027361 is an equidigital number, since it uses as much as digits as its factorization.

78111027361 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 14112, while the sum is 37.

The spelling of 78111027361 in words is "seventy-eight billion, one hundred eleven million, twenty-seven thousand, three hundred sixty-one".