55666679 has 2 divisors, whose sum is σ = 55666680. Its totient is φ = 55666678.

The previous prime is 55666657. The next prime is 55666697. The reversal of 55666679 is 97666655.

Together with next prime (55666697) it forms an Ormiston pair, because they use the same digits, order apart.

It is a strong prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55666679 is a prime.

It is a plaindrome in base 10.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55666649) 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 as a sum of consecutive naturals, namely, 27833339 + 27833340.

It is an arithmetic number, because the mean of its divisors is an integer number (27833340).

Almost surely, 2^55666679 is an apocalyptic number.

55666679 is a deficient number, since it is larger than the sum of its proper divisors (1).

55666679 is an equidigital number, since it uses as much as digits as its factorization.

55666679 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2041200, while the sum is 50.

The square root of 55666679 is about 7461.0105883855. The cubic root of 55666679 is about 381.8256539268.

The spelling of 55666679 in words is "fifty-five million, six hundred sixty-six thousand, six hundred seventy-nine".