78616686305 has 16 divisors (see below), whose sum is σ = 94664862864. Its totient is φ = 62676906240.

The previous prime is 78616686301. The next prime is 78616686307. The reversal of 78616686305 is 50368661687.

It is a happy number.

It can be written as a sum of positive squares in 8 ways, for example, as 40781379136 + 37835307169 = 201944^2 + 194513^2 .

It is not a de Polignac number, because 78616686305 - 2² = 78616686301 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78616686301) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9475739 + ... + 9484031.

It is an arithmetic number, because the mean of its divisors is an integer number (5916553929).

Almost surely, 2^78616686305 is an apocalyptic number.

It is an amenable number.

78616686305 is a deficient number, since it is larger than the sum of its proper divisors (16048176559).

78616686305 is a wasteful number, since it uses less digits than its factorization.

78616686305 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14596.

The product of its (nonzero) digits is 8709120, while the sum is 56.

The spelling of 78616686305 in words is "seventy-eight billion, six hundred sixteen million, six hundred eighty-six thousand, three hundred five".