71810066 has 4 divisors (see below), whose sum is σ = 107715102. Its totient is φ = 35905032.

The previous prime is 71810033. The next prime is 71810069. The reversal of 71810066 is 66001817.

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., 69472225 + 2337841 = 8335^2 + 1529^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (71810069) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 17952515 + ... + 17952518.

Almost surely, 2^71810066 is an apocalyptic number.

71810066 is a deficient number, since it is larger than the sum of its proper divisors (35905036).

71810066 is a wasteful number, since it uses less digits than its factorization.

71810066 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 35905035.

The product of its (nonzero) digits is 2016, while the sum is 29.

The square root of 71810066 is about 8474.0820151802. The cubic root of 71810066 is about 415.6506289131.

The spelling of 71810066 in words is "seventy-one million, eight hundred ten thousand, sixty-six".