55605561 has 16 divisors (see below), whose sum is σ = 83068608. Its totient is φ = 32788800.

The previous prime is 55605527. The next prime is 55605577. The reversal of 55605561 is 16550655.

55605561 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is not a de Polignac number, because 55605561 - 2⁶ = 55605497 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (33).

It is not an unprimeable number, because it can be changed into a prime (55605581) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 21550 + ... + 23991.

It is an arithmetic number, because the mean of its divisors is an integer number (5191788).

Almost surely, 2^55605561 is an apocalyptic number.

It is an amenable number.

55605561 is a deficient number, since it is larger than the sum of its proper divisors (27463047).

55605561 is a wasteful number, since it uses less digits than its factorization.

55605561 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 45592.

The product of its (nonzero) digits is 22500, while the sum is 33.

The square root of 55605561 is about 7456.9136376922. The cubic root of 55605561 is about 381.6858637416.

The spelling of 55605561 in words is "fifty-five million, six hundred five thousand, five hundred sixty-one".