78842116688 has 20 divisors (see below), whose sum is σ = 152782025268. Its totient is φ = 39414497280.

The previous prime is 78842116681. The next prime is 78842116693. The reversal of 78842116688 is 88661124887.

It can be written as a sum of positive squares in 2 ways, for example, as 16896880144 + 61945236544 = 129988^2 + 248888^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78842116681) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 310193 + ... + 503888.

Almost surely, 2^78842116688 is an apocalyptic number.

It is an amenable number.

78842116688 is a deficient number, since it is larger than the sum of its proper divisors (73939908580).

78842116688 is a wasteful number, since it uses less digits than its factorization.

78842116688 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 820142 (or 820136 counting only the distinct ones).

The product of its digits is 8257536, while the sum is 59.

The spelling of 78842116688 in words is "seventy-eight billion, eight hundred forty-two million, one hundred sixteen thousand, six hundred eighty-eight".