55561005601 has 2 divisors, whose sum is σ = 55561005602. Its totient is φ = 55561005600.

The previous prime is 55561005583. The next prime is 55561005611. The reversal of 55561005601 is 10650016555.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 45572002576 + 9989003025 = 213476^2 + 99945^2 .

It is a cyclic number.

It is not a de Polignac number, because 55561005601 - 2¹⁹ = 55560481313 is a prime.

It is not a weakly prime, because it can be changed into another prime (55561005611) 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, 27780502800 + 27780502801.

It is an arithmetic number, because the mean of its divisors is an integer number (27780502801).

Almost surely, 2^55561005601 is an apocalyptic number.

It is an amenable number.

55561005601 is a deficient number, since it is larger than the sum of its proper divisors (1).

55561005601 is an equidigital number, since it uses as much as digits as its factorization.

55561005601 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 22500, while the sum is 34.

The spelling of 55561005601 in words is "fifty-five billion, five hundred sixty-one million, five thousand, six hundred one".