121816668186 has 48 divisors (see below), whose sum is σ = 267857913960. Its totient is φ = 40003476480.

The previous prime is 121816668167. The next prime is 121816668199. The reversal of 121816668186 is 681866618121.

It can be written as a sum of positive squares in 4 ways, for example, as 115195754025 + 6620914161 = 339405^2 + 81369^2 .

It is a Smith number, since the sum of its digits (54) coincides with the sum of the digits of its prime factors.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 1105020 + ... + 1210248.

Almost surely, 2^121816668186 is an apocalyptic number.

121816668186 is an abundant number, since it is smaller than the sum of its proper divisors (146041245774).

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

121816668186 is a wasteful number, since it uses less digits than its factorization.

121816668186 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 106191 (or 106188 counting only the distinct ones).

The product of its digits is 1327104, while the sum is 54.

The spelling of 121816668186 in words is "one hundred twenty-one billion, eight hundred sixteen million, six hundred sixty-eight thousand, one hundred eighty-six".