71568842066569 has 9 divisors (see below), whose sum is σ = 74816025073293. Its totient is φ = 68456967164652.

The previous prime is 71568842066483. The next prime is 71568842066653. The reversal of 71568842066569 is 96566024886517.

The square root of 71568842066569 is 8459837.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 71568842066569 - 2¹¹ = 71568842064521 is a prime.

It is a super-2 number, since 2×71568842066569² (a number of 29 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (71568642066569) by changing a digit.

It is a polite number, since it can be written in 8 ways as a sum of consecutive naturals, for example, 194392342 + ... + 194760160.

Almost surely, 2^{71568842066569} is an apocalyptic number.

71568842066569 is the 8459837-th square number.

71568842066569 is the 4229919-th centered octagonal number.

It is an amenable number.

71568842066569 is a deficient number, since it is larger than the sum of its proper divisors (3247183006724).

71568842066569 is an frugal number, since it uses more digits than its factorization.

71568842066569 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 735684 (or 367842 counting only the distinct ones).

The product of its (nonzero) digits is 1045094400, while the sum is 73.

The spelling of 71568842066569 in words is "seventy-one trillion, five hundred sixty-eight billion, eight hundred forty-two million, sixty-six thousand, five hundred sixty-nine".