78564226117 has 16 divisors (see below), whose sum is σ = 88306566768. Its totient is φ = 69417054720.

The previous prime is 78564226093. The next prime is 78564226123. The reversal of 78564226117 is 71162246587.

It can be written as a sum of positive squares in 8 ways, for example, as 5205045316 + 73359180801 = 72146^2 + 270849^2 .

It is not a de Polignac number, because 78564226117 - 2²⁷ = 78430008389 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78564226177) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1362318 + ... + 1418815.

It is an arithmetic number, because the mean of its divisors is an integer number (5519160423).

Almost surely, 2^78564226117 is an apocalyptic number.

It is an amenable number.

78564226117 is a deficient number, since it is larger than the sum of its proper divisors (9742340651).

78564226117 is a wasteful number, since it uses less digits than its factorization.

78564226117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2781240.

The product of its digits is 1128960, while the sum is 49.

The spelling of 78564226117 in words is "seventy-eight billion, five hundred sixty-four million, two hundred twenty-six thousand, one hundred seventeen".