78715748161 has 16 divisors (see below), whose sum is σ = 82197117520. Its totient is φ = 75306516480.

The previous prime is 78715748149. The next prime is 78715748179. The reversal of 78715748161 is 16184751787.

It can be written as a sum of positive squares in 8 ways, for example, as 6378418225 + 72337329936 = 79865^2 + 268956^2 .

It is a cyclic number.

It is not a de Polignac number, because 78715748161 - 2³⁵ = 44356009793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (78715748141) 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, 10507105 + ... + 10514593.

It is an arithmetic number, because the mean of its divisors is an integer number (5137319845).

Almost surely, 2^78715748161 is an apocalyptic number.

It is an amenable number.

78715748161 is a deficient number, since it is larger than the sum of its proper divisors (3481369359).

78715748161 is a wasteful number, since it uses less digits than its factorization.

78715748161 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 12244.

The product of its digits is 2634240, while the sum is 55.

The spelling of 78715748161 in words is "seventy-eight billion, seven hundred fifteen million, seven hundred forty-eight thousand, one hundred sixty-one".