71566085 has 4 divisors (see below), whose sum is σ = 85879308. Its totient is φ = 57252864.

The previous prime is 71566037. The next prime is 71566091. The reversal of 71566085 is 58066517.

It is a happy number.

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

It can be written as a sum of positive squares in 2 ways, for example, as 44702596 + 26863489 = 6686^2 + 5183^2 .

It is a cyclic number.

It is not a de Polignac number, because 71566085 - 2¹⁰ = 71565061 is a prime.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7156604 + ... + 7156613.

It is an arithmetic number, because the mean of its divisors is an integer number (21469827).

Almost surely, 2^71566085 is an apocalyptic number.

It is an amenable number.

71566085 is a deficient number, since it is larger than the sum of its proper divisors (14313223).

71566085 is a wasteful number, since it uses less digits than its factorization.

71566085 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 14313222.

The product of its (nonzero) digits is 50400, while the sum is 38.

The square root of 71566085 is about 8459.6740480943. The cubic root of 71566085 is about 415.1793582878.

The spelling of 71566085 in words is "seventy-one million, five hundred sixty-six thousand, eighty-five".