78531118478416 has 40 divisors (see below), whose sum is σ = 157403194245000. Its totient is φ = 37910981660160.

The previous prime is 78531118478411. The next prime is 78531118478443. The reversal of 78531118478416 is 61487481113587.

It can be written as a sum of positive squares in 4 ways, for example, as 1391588416 + 78529726890000 = 37304^2 + 8861700^2 .

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (78531118478411) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 29139210 + ... + 31719958.

It is an arithmetic number, because the mean of its divisors is an integer number (3935079856125).

Almost surely, 2^{78531118478416} is an apocalyptic number.

It is an amenable number.

78531118478416 is an abundant number, since it is smaller than the sum of its proper divisors (78872075766584).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

78531118478416 is a wasteful number, since it uses less digits than its factorization.

78531118478416 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2646367 (or 2646361 counting only the distinct ones).

The product of its digits is 36126720, while the sum is 64.

The spelling of 78531118478416 in words is "seventy-eight trillion, five hundred thirty-one billion, one hundred eighteen million, four hundred seventy-eight thousand, four hundred sixteen".