78442617782065 has 32 divisors (see below), whose sum is σ = 99206747136000. Its totient is φ = 59378480441280.

The previous prime is 78442617782051. The next prime is 78442617782071. The reversal of 78442617782065 is 56028771624487.

It is not a de Polignac number, because 78442617782065 - 2³⁵ = 78408258043697 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 334251636 + ... + 334486234.

It is an arithmetic number, because the mean of its divisors is an integer number (3100210848000).

Almost surely, 2^{78442617782065} is an apocalyptic number.

It is an amenable number.

78442617782065 is a deficient number, since it is larger than the sum of its proper divisors (20764129353935).

78442617782065 is a wasteful number, since it uses less digits than its factorization.

78442617782065 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 238917.

The product of its (nonzero) digits is 252887040, while the sum is 67.

The spelling of 78442617782065 in words is "seventy-eight trillion, four hundred forty-two billion, six hundred seventeen million, seven hundred eighty-two thousand, sixty-five".