66000557 has 8 divisors (see below), whose sum is σ = 75499200. Its totient is φ = 56519424.

The previous prime is 66000553. The next prime is 66000569. The reversal of 66000557 is 75500066.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 66000557 - 2² = 66000553 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66000553) 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 7 ways as a sum of consecutive naturals, for example, 5069 + ... + 12557.

It is an arithmetic number, because the mean of its divisors is an integer number (9437400).

Almost surely, 2^66000557 is an apocalyptic number.

It is an amenable number.

66000557 is a deficient number, since it is larger than the sum of its proper divisors (9498643).

66000557 is a wasteful number, since it uses less digits than its factorization.

66000557 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8755.

The product of its (nonzero) digits is 6300, while the sum is 29.

The square root of 66000557 is about 8124.0726855439. The cubic root of 66000557 is about 404.1251389129.

The spelling of 66000557 in words is "sixty-six million, five hundred fifty-seven", and thus it is an aban number.