18183918212 has 6 divisors (see below), whose sum is σ = 31821856878. Its totient is φ = 9091959104.

The previous prime is 18183918211. The next prime is 18183918349. The reversal of 18183918212 is 21281938181.

It can be written as a sum of positive squares in only one way, i.e., 9893087296 + 8290830916 = 99464^2 + 91054^2 .

It is not an unprimeable number, because it can be changed into a prime (18183918211) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 2272989773 + ... + 2272989780.

It is an arithmetic number, because the mean of its divisors is an integer number (5303642813).

Almost surely, 2^18183918212 is an apocalyptic number.

It is an amenable number.

18183918212 is a deficient number, since it is larger than the sum of its proper divisors (13637938666).

18183918212 is a wasteful number, since it uses less digits than its factorization.

18183918212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4545979557 (or 4545979555 counting only the distinct ones).

The product of its digits is 55296, while the sum is 44.

The spelling of 18183918212 in words is "eighteen billion, one hundred eighty-three million, nine hundred eighteen thousand, two hundred twelve".