78016066 has 4 divisors (see below), whose sum is σ = 117024102. Its totient is φ = 39008032.

The previous prime is 78016039. The next prime is 78016067. The reversal of 78016066 is 66061087.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 66061087 = 149 ⋅443363.

It can be written as a sum of positive squares in only one way, i.e., 51194025 + 26822041 = 7155^2 + 5179^2 .

It is not an unprimeable number, because it can be changed into a prime (78016067) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 19504015 + ... + 19504018.

Almost surely, 2^78016066 is an apocalyptic number.

78016066 is a deficient number, since it is larger than the sum of its proper divisors (39008036).

78016066 is a wasteful number, since it uses less digits than its factorization.

78016066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39008035.

The product of its (nonzero) digits is 12096, while the sum is 34.

The square root of 78016066 is about 8832.6703776378. The cubic root of 78016066 is about 427.2952014270.

The spelling of 78016066 in words is "seventy-eight million, sixteen thousand, sixty-six".