55565687 has 2 divisors, whose sum is σ = 55565688. Its totient is φ = 55565686.

The previous prime is 55565663. The next prime is 55565689. The reversal of 55565687 is 78656555.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 55565687 - 2⁸ = 55565431 is a prime.

Together with 55565689, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55565689) 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 as a sum of consecutive naturals, namely, 27782843 + 27782844.

It is an arithmetic number, because the mean of its divisors is an integer number (27782844).

Almost surely, 2^55565687 is an apocalyptic number.

55565687 is a deficient number, since it is larger than the sum of its proper divisors (1).

55565687 is an equidigital number, since it uses as much as digits as its factorization.

55565687 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 55565687 is about 7454.2395319711. The cubic root of 55565687 is about 381.5946079921.

The spelling of 55565687 in words is "fifty-five million, five hundred sixty-five thousand, six hundred eighty-seven".