78242117488117 has 16 divisors (see below), whose sum is σ = 90386900860032. Its totient is φ = 66936994629120.

The previous prime is 78242117488109. The next prime is 78242117488127. The reversal of 78242117488117 is 71188471124287.

It is a happy number.

It is not a de Polignac number, because 78242117488117 - 2³ = 78242117488109 is a prime.

It is a super-2 number, since 2×78242117488117² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78242117488127) 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, 23870793 + ... + 26949934.

It is an arithmetic number, because the mean of its divisors is an integer number (5649181303752).

Almost surely, 2^{78242117488117} is an apocalyptic number.

It is an amenable number.

78242117488117 is a deficient number, since it is larger than the sum of its proper divisors (12144783371915).

78242117488117 is a wasteful number, since it uses less digits than its factorization.

78242117488117 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 50828988.

The product of its digits is 11239424, while the sum is 61.

The spelling of 78242117488117 in words is "seventy-eight trillion, two hundred forty-two billion, one hundred seventeen million, four hundred eighty-eight thousand, one hundred seventeen".