55556887 has 2 divisors, whose sum is σ = 55556888. Its totient is φ = 55556886.

The previous prime is 55556873. The next prime is 55556923. The reversal of 55556887 is 78865555.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-55556887 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 55556887.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55556807) 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, 27778443 + 27778444.

It is an arithmetic number, because the mean of its divisors is an integer number (27778444).

Almost surely, 2^55556887 is an apocalyptic number.

55556887 is a deficient number, since it is larger than the sum of its proper divisors (1).

55556887 is an equidigital number, since it uses as much as digits as its factorization.

55556887 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1680000, while the sum is 49.

The square root of 55556887 is about 7453.6492404727. The cubic root of 55556887 is about 381.5744624069.

The spelling of 55556887 in words is "fifty-five million, five hundred fifty-six thousand, eight hundred eighty-seven".