18061155 has 36 divisors (see below), whose sum is σ = 36421632. Its totient is φ = 8255520.

The previous prime is 18061111. The next prime is 18061163. The reversal of 18061155 is 55116081.

It is not a de Polignac number, because 18061155 - 2¹⁴ = 18044771 is a prime.

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 35 ways as a sum of consecutive naturals, for example, 1891 + ... + 6300.

It is an arithmetic number, because the mean of its divisors is an integer number (1011712).

Almost surely, 2^18061155 is an apocalyptic number.

18061155 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

18061155 is an abundant number, since it is smaller than the sum of its proper divisors (18360477).

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

18061155 is a wasteful number, since it uses less digits than its factorization.

18061155 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8216 (or 8206 counting only the distinct ones).

The product of its (nonzero) digits is 1200, while the sum is 27.

The square root of 18061155 is about 4249.8417617601. The cubic root of 18061155 is about 262.3706028920.

The spelling of 18061155 in words is "eighteen million, sixty-one thousand, one hundred fifty-five".