55505555557 has 2 divisors, whose sum is σ = 55505555558. Its totient is φ = 55505555556.

The previous prime is 55505555537. The next prime is 55505555641. The reversal of 55505555557 is 75555550555.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 33561873601 + 21943681956 = 183199^2 + 148134^2 .

It is a cyclic number.

It is not a de Polignac number, because 55505555557 - 2²⁷ = 55371337829 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (55505555507) 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, 27752777778 + 27752777779.

It is an arithmetic number, because the mean of its divisors is an integer number (27752777779).

Almost surely, 2^55505555557 is an apocalyptic number.

It is an amenable number.

55505555557 is a deficient number, since it is larger than the sum of its proper divisors (1).

55505555557 is an equidigital number, since it uses as much as digits as its factorization.

55505555557 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 13671875, while the sum is 52.

The spelling of 55505555557 in words is "fifty-five billion, five hundred five million, five hundred fifty-five thousand, five hundred fifty-seven".