12180644866 has 32 divisors (see below), whose sum is σ = 20221045488. Its totient is φ = 5466424320.

The previous prime is 12180644863. The next prime is 12180644869. The reversal of 12180644866 is 66844608121.

It is an interprime number because it is at equal distance from previous prime (12180644863) and next prime (12180644869).

It can be written as a sum of positive squares in 8 ways, for example, as 5599379241 + 6581265625 = 74829^2 + 81125^2 .

It is a super-2 number, since 2×12180644866² (a number of 21 digits) contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (12180644863) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 2068246 + ... + 2074126.

Almost surely, 2^12180644866 is an apocalyptic number.

12180644866 is a deficient number, since it is larger than the sum of its proper divisors (8040400622).

12180644866 is a wasteful number, since it uses less digits than its factorization.

12180644866 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8086.

The product of its (nonzero) digits is 442368, while the sum is 46.

The spelling of 12180644866 in words is "twelve billion, one hundred eighty million, six hundred forty-four thousand, eight hundred sixty-six".