18180820052 has 12 divisors (see below), whose sum is σ = 31817384340. Its totient is φ = 9090138816.

The previous prime is 18180820039. The next prime is 18180820061. The reversal of 18180820052 is 25002808181.

It can be written as a sum of positive squares in 2 ways, for example, as 10345737796 + 7835082256 = 101714^2 + 88516^2 .

It is a junction number, because it is equal to n+sod(n) for n = 18180819994 and 18180820021.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 204848 + ... + 279864.

It is an arithmetic number, because the mean of its divisors is an integer number (2651448695).

Almost surely, 2^18180820052 is an apocalyptic number.

It is an amenable number.

18180820052 is a deficient number, since it is larger than the sum of its proper divisors (13636564288).

18180820052 is a wasteful number, since it uses less digits than its factorization.

18180820052 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 135610 (or 135608 counting only the distinct ones).

The product of its (nonzero) digits is 10240, while the sum is 35.

The spelling of 18180820052 in words is "eighteen billion, one hundred eighty million, eight hundred twenty thousand, fifty-two".