18055545 has 16 divisors (see below), whose sum is σ = 29885760. Its totient is φ = 9297344.

The previous prime is 18055517. The next prime is 18055553. The reversal of 18055545 is 54555081.

It is a cyclic number.

It is not a de Polignac number, because 18055545 - 2⁷ = 18055417 is a prime.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 20319 + ... + 21188.

It is an arithmetic number, because the mean of its divisors is an integer number (1867860).

Almost surely, 2^18055545 is an apocalyptic number.

18055545 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

18055545 is a deficient number, since it is larger than the sum of its proper divisors (11830215).

18055545 is a wasteful number, since it uses less digits than its factorization.

18055545 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41544.

The product of its (nonzero) digits is 20000, while the sum is 33.

The square root of 18055545 is about 4249.1816859249. The cubic root of 18055545 is about 262.3434349819.

The spelling of 18055545 in words is "eighteen million, fifty-five thousand, five hundred forty-five".