78504360091873 has 2 divisors, whose sum is σ = 78504360091874. Its totient is φ = 78504360091872.

The previous prime is 78504360091867. The next prime is 78504360091903. The reversal of 78504360091873 is 37819006340587.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 71558352253089 + 6946007838784 = 8459217^2 + 2635528^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-78504360091873 is a prime.

It is not a weakly prime, because it can be changed into another prime (78504360095873) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39252180045936 + 39252180045937.

It is an arithmetic number, because the mean of its divisors is an integer number (39252180045937).

Almost surely, 2^{78504360091873} is an apocalyptic number.

It is an amenable number.

78504360091873 is a deficient number, since it is larger than the sum of its proper divisors (1).

78504360091873 is an equidigital number, since it uses as much as digits as its factorization.

78504360091873 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 30481920, while the sum is 61.

The spelling of 78504360091873 in words is "seventy-eight trillion, five hundred four billion, three hundred sixty million, ninety-one thousand, eight hundred seventy-three".