55155618 has 24 divisors (see below), whose sum is σ = 136576128. Its totient is φ = 15758712.

The previous prime is 55155559. The next prime is 55155629. The reversal of 55155618 is 81655155.

55155618 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is an unprimeable number.

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 11 ways as a sum of consecutive naturals, for example, 218746 + ... + 218997.

It is an arithmetic number, because the mean of its divisors is an integer number (5690672).

Almost surely, 2^55155618 is an apocalyptic number.

55155618 is an abundant number, since it is smaller than the sum of its proper divisors (81420510).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

55155618 is a wasteful number, since it uses less digits than its factorization.

55155618 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 437758 (or 437755 counting only the distinct ones).

The product of its digits is 30000, while the sum is 36.

The square root of 55155618 is about 7426.6828395994. The cubic root of 55155618 is about 380.6535797576.

It can be divided in two parts, 551 and 55618, that added together give a square (56169 = 237²).

The spelling of 55155618 in words is "fifty-five million, one hundred fifty-five thousand, six hundred eighteen".