78561566116 has 48 divisors (see below), whose sum is σ = 152400003840. Its totient is φ = 35136990720.

The previous prime is 78561566113. The next prime is 78561566129. The reversal of 78561566116 is 61166516587.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (78561566113) 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, 979900 + ... + 1057036.

It is an arithmetic number, because the mean of its divisors is an integer number (3175000080).

Almost surely, 2^78561566116 is an apocalyptic number.

It is an amenable number.

78561566116 is a deficient number, since it is larger than the sum of its proper divisors (73838437724).

78561566116 is a wasteful number, since it uses less digits than its factorization.

78561566116 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 77524 (or 77522 counting only the distinct ones).

The product of its digits is 1814400, while the sum is 52.

The spelling of 78561566116 in words is "seventy-eight billion, five hundred sixty-one million, five hundred sixty-six thousand, one hundred sixteen".