12165866178 has 16 divisors (see below), whose sum is σ = 24989347200. Its totient is φ = 3945686256.

The previous prime is 12165866177. The next prime is 12165866263. The reversal of 12165866178 is 87166856121.

It is a super-2 number, since 2×12165866178² (a number of 21 digits) contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 12165866178.

It is not an unprimeable number, because it can be changed into a prime (12165866177) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 27400378 + ... + 27400821.

It is an arithmetic number, because the mean of its divisors is an integer number (1561834200).

Almost surely, 2^12165866178 is an apocalyptic number.

12165866178 is an abundant number, since it is smaller than the sum of its proper divisors (12823481022).

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

12165866178 is a wasteful number, since it uses less digits than its factorization.

12165866178 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54801241.

The product of its digits is 967680, while the sum is 51.

The spelling of 12165866178 in words is "twelve billion, one hundred sixty-five million, eight hundred sixty-six thousand, one hundred seventy-eight".