78565846816 has 12 divisors (see below), whose sum is σ = 154676510982. Its totient is φ = 39282923392.

The previous prime is 78565846813. The next prime is 78565846837. The reversal of 78565846816 is 61864856587.

It can be written as a sum of positive squares in only one way, i.e., 76067846416 + 2498000400 = 275804^2 + 49980^2 .

It is not an unprimeable number, because it can be changed into a prime (78565846813) 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 as a sum of consecutive naturals, namely, 1227591325 + ... + 1227591388.

Almost surely, 2^78565846816 is an apocalyptic number.

It is an amenable number.

78565846816 is a deficient number, since it is larger than the sum of its proper divisors (76110664166).

78565846816 is a wasteful number, since it uses less digits than its factorization.

78565846816 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2455182723 (or 2455182715 counting only the distinct ones).

The product of its digits is 77414400, while the sum is 64.

The spelling of 78565846816 in words is "seventy-eight billion, five hundred sixty-five million, eight hundred forty-six thousand, eight hundred sixteen".