55581555 has 16 divisors (see below), whose sum is σ = 93611520. Its totient is φ = 28083168.

The previous prime is 55581541. The next prime is 55581557. The reversal of 55581555 is 55518555.

55581555 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 55581555 - 2⁵ = 55581523 is a prime.

It is not an unprimeable number, because it can be changed into a prime (55581557) 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, 97227 + ... + 97796.

It is an arithmetic number, because the mean of its divisors is an integer number (5850720).

Almost surely, 2^55581555 is an apocalyptic number.

55581555 is a deficient number, since it is larger than the sum of its proper divisors (38029965).

55581555 is a wasteful number, since it uses less digits than its factorization.

55581555 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 195050.

The product of its digits is 125000, while the sum is 39.

The square root of 55581555 is about 7455.3038167468. The cubic root of 55581555 is about 381.6309287700.

The spelling of 55581555 in words is "fifty-five million, five hundred eighty-one thousand, five hundred fifty-five".