71080066 has 4 divisors (see below), whose sum is σ = 106620102. Its totient is φ = 35540032.

The previous prime is 71080039. The next prime is 71080069. The reversal of 71080066 is 66008017.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in only one way, i.e., 44609041 + 26471025 = 6679^2 + 5145^2 .

It is not an unprimeable number, because it can be changed into a prime (71080069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17770015 + ... + 17770018.

Almost surely, 2^71080066 is an apocalyptic number.

71080066 is a deficient number, since it is larger than the sum of its proper divisors (35540036).

71080066 is a wasteful number, since it uses less digits than its factorization.

71080066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35540035.

The product of its (nonzero) digits is 2016, while the sum is 28.

The square root of 71080066 is about 8430.8994775172. The cubic root of 71080066 is about 414.2373684482.

The spelling of 71080066 in words is "seventy-one million, eighty thousand, sixty-six".