78643650085 has 64 divisors (see below), whose sum is σ = 129656862720. Its totient is φ = 44200961280.

The previous prime is 78643650073. The next prime is 78643650091. The reversal of 78643650085 is 58005634687.

It is not a de Polignac number, because 78643650085 - 2⁹ = 78643649573 is a prime.

It is a congruent number.

It is an unprimeable number.

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 in 63 ways as a sum of consecutive naturals, for example, 32506 + ... + 397924.

It is an arithmetic number, because the mean of its divisors is an integer number (2025888480).

Almost surely, 2^78643650085 is an apocalyptic number.

It is an amenable number.

78643650085 is a deficient number, since it is larger than the sum of its proper divisors (51013212635).

78643650085 is a wasteful number, since it uses less digits than its factorization.

78643650085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 365498.

The product of its (nonzero) digits is 4838400, while the sum is 52.

The spelling of 78643650085 in words is "seventy-eight billion, six hundred forty-three million, six hundred fifty thousand, eighty-five".