66560571 has 36 divisors (see below), whose sum is σ = 122016024. Its totient is φ = 34574400.

The previous prime is 66560569. The next prime is 66560579. The reversal of 66560571 is 17506566.

It is a happy number.

It is not a de Polignac number, because 66560571 - 2¹ = 66560569 is a prime.

It is a super-2 number, since 2×66560571² = 8860619223692082, which contains 22 as substring.

It is a Smith number, since the sum of its digits (36) coincides with the sum of the digits of its prime factors.

It is not an unprimeable number, because it can be changed into a prime (66560579) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 35 ways as a sum of consecutive naturals, for example, 2010 + ... + 11711.

It is an arithmetic number, because the mean of its divisors is an integer number (3389334).

Almost surely, 2^66560571 is an apocalyptic number.

66560571 is a deficient number, since it is larger than the sum of its proper divisors (55455453).

66560571 is a wasteful number, since it uses less digits than its factorization.

66560571 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 13752 (or 13742 counting only the distinct ones).

The product of its (nonzero) digits is 37800, while the sum is 36.

The square root of 66560571 is about 8158.4662161463. The cubic root of 66560571 is about 405.2649204070.

The spelling of 66560571 in words is "sixty-six million, five hundred sixty thousand, five hundred seventy-one".