18167805212 has 24 divisors (see below), whose sum is σ = 32263501536. Its totient is φ = 8949927168.

The previous prime is 18167805211. The next prime is 18167805239. The reversal of 18167805212 is 21250876181.

It is a self number, because there is not a number n which added to its sum of digits gives 18167805212.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18167805211) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 245633 + ... + 310919.

It is an arithmetic number, because the mean of its divisors is an integer number (1344312564).

Almost surely, 2^18167805212 is an apocalyptic number.

It is an amenable number.

18167805212 is a deficient number, since it is larger than the sum of its proper divisors (14095696324).

18167805212 is a wasteful number, since it uses less digits than its factorization.

18167805212 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 66317 (or 66315 counting only the distinct ones).

The product of its (nonzero) digits is 53760, while the sum is 41.

The spelling of 18167805212 in words is "eighteen billion, one hundred sixty-seven million, eight hundred five thousand, two hundred twelve".