71066111 has 4 divisors (see below), whose sum is σ = 71317512. Its totient is φ = 70814712.

The previous prime is 71066087. The next prime is 71066117. The reversal of 71066111 is 11166017.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 11166017 = 23 ⋅485479.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-71066111 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (71066117) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 125276 + ... + 125841.

It is an arithmetic number, because the mean of its divisors is an integer number (17829378).

Almost surely, 2^71066111 is an apocalyptic number.

71066111 is a deficient number, since it is larger than the sum of its proper divisors (251401).

71066111 is a wasteful number, since it uses less digits than its factorization.

71066111 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 251400.

The product of its (nonzero) digits is 252, while the sum is 23.

The square root of 71066111 is about 8430.0718265030. The cubic root of 71066111 is about 414.2102578899.

The spelling of 71066111 in words is "seventy-one million, sixty-six thousand, one hundred eleven".