55566857 has 2 divisors, whose sum is σ = 55566858. Its totient is φ = 55566856.

The previous prime is 55566851. The next prime is 55566869. The reversal of 55566857 is 75866555.

55566857 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 55071241 + 495616 = 7421^2 + 704^2 .

It is a cyclic number.

It is not a de Polignac number, because 55566857 - 2¹⁰ = 55565833 is a prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (55566851) 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 as a sum of consecutive naturals, namely, 27783428 + 27783429.

It is an arithmetic number, because the mean of its divisors is an integer number (27783429).

Almost surely, 2^55566857 is an apocalyptic number.

It is an amenable number.

55566857 is a deficient number, since it is larger than the sum of its proper divisors (1).

55566857 is an equidigital number, since it uses as much as digits as its factorization.

55566857 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1260000, while the sum is 47.

The square root of 55566857 is about 7454.3180103883. The cubic root of 55566857 is about 381.5972862790.

The spelling of 55566857 in words is "fifty-five million, five hundred sixty-six thousand, eight hundred fifty-seven".