55666571 has 4 divisors (see below), whose sum is σ = 55791000. Its totient is φ = 55542144.

The previous prime is 55666543. The next prime is 55666577. The reversal of 55666571 is 17566655.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55666571 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (55666577) 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, 61541 + ... + 62438.

It is an arithmetic number, because the mean of its divisors is an integer number (13947750).

Almost surely, 2^55666571 is an apocalyptic number.

55666571 is a deficient number, since it is larger than the sum of its proper divisors (124429).

55666571 is a wasteful number, since it uses less digits than its factorization.

55666571 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 124428.

The product of its digits is 189000, while the sum is 41.

The square root of 55666571 is about 7461.0033507565. The cubic root of 55666571 is about 381.8254069975.

The spelling of 55666571 in words is "fifty-five million, six hundred sixty-six thousand, five hundred seventy-one".