78619928173 has 2 divisors, whose sum is σ = 78619928174. Its totient is φ = 78619928172.

The previous prime is 78619928159. The next prime is 78619928291. The reversal of 78619928173 is 37182991687.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 69023374729 + 9596553444 = 262723^2 + 97962^2 .

It is a cyclic number.

It is not a de Polignac number, because 78619928173 - 2¹⁷ = 78619797101 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (78619928473) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 39309964086 + 39309964087.

It is an arithmetic number, because the mean of its divisors is an integer number (39309964087).

Almost surely, 2^78619928173 is an apocalyptic number.

It is an amenable number.

78619928173 is a deficient number, since it is larger than the sum of its proper divisors (1).

78619928173 is an equidigital number, since it uses as much as digits as its factorization.

78619928173 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 9144576, while the sum is 61.

The spelling of 78619928173 in words is "seventy-eight billion, six hundred nineteen million, nine hundred twenty-eight thousand, one hundred seventy-three".