18609125820 has 48 divisors (see below), whose sum is σ = 55170587808. Its totient is φ = 4670525440.

The previous prime is 18609125819. The next prime is 18609125851. The reversal of 18609125820 is 2852190681.

It is a happy number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 9121101 + ... + 9123140.

It is an arithmetic number, because the mean of its divisors is an integer number (1149387246).

Almost surely, 2^18609125820 is an apocalyptic number.

18609125820 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

18609125820 is an abundant number, since it is smaller than the sum of its proper divisors (36561461988).

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

18609125820 is a wasteful number, since it uses less digits than its factorization.

18609125820 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 18244270 (or 18244268 counting only the distinct ones).

The product of its (nonzero) digits is 69120, while the sum is 42.

The spelling of 18609125820 in words is "eighteen billion, six hundred nine million, one hundred twenty-five thousand, eight hundred twenty".