71586661 has 6 divisors (see below), whose sum is σ = 75553062. Its totient is φ = 67818600.

The previous prime is 71586631. The next prime is 71586667. The reversal of 71586661 is 16668517.

It can be written as a sum of positive squares in only one way, i.e., 39312900 + 32273761 = 6270^2 + 5681^2 .

It is not a de Polignac number, because 71586661 - 2⁹ = 71586149 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 (71586667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 98790 + ... + 99511.

It is an arithmetic number, because the mean of its divisors is an integer number (12592177).

Almost surely, 2^71586661 is an apocalyptic number.

It is an amenable number.

71586661 is a deficient number, since it is larger than the sum of its proper divisors (3966401).

71586661 is a wasteful number, since it uses less digits than its factorization.

71586661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 198339 (or 198320 counting only the distinct ones).

The product of its digits is 60480, while the sum is 40.

The square root of 71586661 is about 8460.8900832005. The cubic root of 71586661 is about 415.2191439483.

The spelling of 71586661 in words is "seventy-one million, five hundred eighty-six thousand, six hundred sixty-one".