66571141 has 16 divisors (see below), whose sum is σ = 82130944. Its totient is φ = 52545024.

The previous prime is 66571123. The next prime is 66571147. The reversal of 66571141 is 14117566.

It is a de Polignac number, because none of the positive numbers 2^k-66571141 is a prime.

It is a super-3 number, since 3×66571141³ (a number of 24 digits) contains 333 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66571147) 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 15 ways as a sum of consecutive naturals, for example, 60700 + ... + 61786.

It is an arithmetic number, because the mean of its divisors is an integer number (5133184).

Almost surely, 2^66571141 is an apocalyptic number.

66571141 is the 4711-st octagonal number.

It is an amenable number.

66571141 is a deficient number, since it is larger than the sum of its proper divisors (15559803).

66571141 is a wasteful number, since it uses less digits than its factorization.

66571141 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1780.

The product of its digits is 5040, while the sum is 31.

The square root of 66571141 is about 8159.1139837607. The cubic root of 66571141 is about 405.2863716627.

The spelling of 66571141 in words is "sixty-six million, five hundred seventy-one thousand, one hundred forty-one".