66116571 has 4 divisors (see below), whose sum is σ = 88155432. Its totient is φ = 44077712.

The previous prime is 66116563. The next prime is 66116573. The reversal of 66116571 is 17561166.

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

It is a cyclic number.

It is not a de Polignac number, because 66116571 - 2³ = 66116563 is a prime.

It is not an unprimeable number, because it can be changed into a prime (66116573) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 11019426 + ... + 11019431.

It is an arithmetic number, because the mean of its divisors is an integer number (22038858).

Almost surely, 2^66116571 is an apocalyptic number.

66116571 is a deficient number, since it is larger than the sum of its proper divisors (22038861).

66116571 is a wasteful number, since it uses less digits than its factorization.

66116571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 22038860.

The product of its digits is 7560, while the sum is 33.

The square root of 66116571 is about 8131.2096886011. The cubic root of 66116571 is about 404.3617870677.

The spelling of 66116571 in words is "sixty-six million, one hundred sixteen thousand, five hundred seventy-one".