57666521 has 4 divisors (see below), whose sum is σ = 62908944. Its totient is φ = 52424100.

The previous prime is 57666517. The next prime is 57666547. The reversal of 57666521 is 12566675.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 57666521 - 2² = 57666517 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (57663521) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 2621195 + ... + 2621216.

It is an arithmetic number, because the mean of its divisors is an integer number (15727236).

Almost surely, 2^57666521 is an apocalyptic number.

It is an amenable number.

57666521 is a deficient number, since it is larger than the sum of its proper divisors (5242423).

57666521 is a wasteful number, since it uses less digits than its factorization.

57666521 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5242422.

The product of its digits is 75600, while the sum is 38.

The square root of 57666521 is about 7593.8475755048. The cubic root of 57666521 is about 386.3443663678.

The spelling of 57666521 in words is "fifty-seven million, six hundred sixty-six thousand, five hundred twenty-one".