57566221 has 8 divisors (see below), whose sum is σ = 58272480. Its totient is φ = 56864592.

The previous prime is 57566213. The next prime is 57566237. The reversal of 57566221 is 12266575.

57566221 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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 57566221 - 2³ = 57566213 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (57566261) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 28191 + ... + 30163.

It is an arithmetic number, because the mean of its divisors is an integer number (7284060).

Almost surely, 2^57566221 is an apocalyptic number.

It is an amenable number.

57566221 is a deficient number, since it is larger than the sum of its proper divisors (706259).

57566221 is a wasteful number, since it uses less digits than its factorization.

57566221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2315.

The product of its digits is 25200, while the sum is 34.

The square root of 57566221 is about 7587.2406710213. The cubic root of 57566221 is about 386.1202454088.

The spelling of 57566221 in words is "fifty-seven million, five hundred sixty-six thousand, two hundred twenty-one".