78188363368417 has 2 divisors, whose sum is σ = 78188363368418. Its totient is φ = 78188363368416.

The previous prime is 78188363368411. The next prime is 78188363368459. The reversal of 78188363368417 is 71486336388187.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69840100847521 + 8348262520896 = 8357039^2 + 2889336^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78188363368417 is a prime.

It is a super-2 number, since 2×78188363368417² (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 78188363368417.

It is not a weakly prime, because it can be changed into another prime (78188363368411) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39094181684208 + 39094181684209.

It is an arithmetic number, because the mean of its divisors is an integer number (39094181684209).

Almost surely, 2^{78188363368417} is an apocalyptic number.

It is an amenable number.

78188363368417 is a deficient number, since it is larger than the sum of its proper divisors (1).

78188363368417 is an equidigital number, since it uses as much as digits as its factorization.

78188363368417 is an evil number, because the sum of its binary digits is even.

The product of its digits is 780337152, while the sum is 73.

The spelling of 78188363368417 in words is "seventy-eight trillion, one hundred eighty-eight billion, three hundred sixty-three million, three hundred sixty-eight thousand, four hundred seventeen".