56005555987 has 2 divisors, whose sum is σ = 56005555988. Its totient is φ = 56005555986.

The previous prime is 56005555967. The next prime is 56005555999. The reversal of 56005555987 is 78955550065.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 56005555987 - 2¹⁹ = 56005031699 is a prime.

It is not a weakly prime, because it can be changed into another prime (56005555967) 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, 28002777993 + 28002777994.

It is an arithmetic number, because the mean of its divisors is an integer number (28002777994).

Almost surely, 2^56005555987 is an apocalyptic number.

56005555987 is a deficient number, since it is larger than the sum of its proper divisors (1).

56005555987 is an equidigital number, since it uses as much as digits as its factorization.

56005555987 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 9450000, while the sum is 55.

The spelling of 56005555987 in words is "fifty-six billion, five million, five hundred fifty-five thousand, nine hundred eighty-seven".