78118025945171 has 2 divisors, whose sum is σ = 78118025945172. Its totient is φ = 78118025945170.

The previous prime is 78118025945059. The next prime is 78118025945177. The reversal of 78118025945171 is 17154952081187.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78118025945171 is a prime.

It is a super-2 number, since 2×78118025945171² (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 78118025945171.

It is not a weakly prime, because it can be changed into another prime (78118025945177) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39059012972585 + 39059012972586.

It is an arithmetic number, because the mean of its divisors is an integer number (39059012972586).

Almost surely, 2^{78118025945171} is an apocalyptic number.

78118025945171 is a deficient number, since it is larger than the sum of its proper divisors (1).

78118025945171 is an equidigital number, since it uses as much as digits as its factorization.

78118025945171 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5644800, while the sum is 59.

The spelling of 78118025945171 in words is "seventy-eight trillion, one hundred eighteen billion, twenty-five million, nine hundred forty-five thousand, one hundred seventy-one".