78090066916 has 27 divisors (see below), whose sum is σ = 145186828969. Its totient is φ = 36743795648.

The previous prime is 78090066889. The next prime is 78090066961. The reversal of 78090066916 is 61966009087.

The square root of 78090066916 is 279446.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 60796764900 + 17293302016 = 246570^2 + 131504^2 .

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 9497055 + ... + 9505273.

Almost surely, 2^78090066916 is an apocalyptic number.

78090066916 is the 279446-th square number.

It is an amenable number.

78090066916 is a deficient number, since it is larger than the sum of its proper divisors (67096762053).

78090066916 is an frugal number, since it uses more digits than its factorization.

78090066916 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 16476 (or 8238 counting only the distinct ones).

The product of its (nonzero) digits is 979776, while the sum is 52.

The spelling of 78090066916 in words is "seventy-eight billion, ninety million, sixty-six thousand, nine hundred sixteen".