18285309188 has 6 divisors (see below), whose sum is σ = 31999291086. Its totient is φ = 9142654592.

The previous prime is 18285309181. The next prime is 18285309227. The reversal of 18285309188 is 88190358281.

It can be written as a sum of positive squares in only one way, i.e., 17797694464 + 487614724 = 133408^2 + 22082^2 .

It is not an unprimeable number, because it can be changed into a prime (18285309181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2285663645 + ... + 2285663652.

It is an arithmetic number, because the mean of its divisors is an integer number (5333215181).

Almost surely, 2^18285309188 is an apocalyptic number.

It is an amenable number.

18285309188 is a deficient number, since it is larger than the sum of its proper divisors (13713981898).

18285309188 is a wasteful number, since it uses less digits than its factorization.

18285309188 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 4571327301 (or 4571327299 counting only the distinct ones).

The product of its (nonzero) digits is 1105920, while the sum is 53.

The spelling of 18285309188 in words is "eighteen billion, two hundred eighty-five million, three hundred nine thousand, one hundred eighty-eight".