121660255778 has 8 divisors (see below), whose sum is σ = 193225112172. Its totient is φ = 57251885056.

The previous prime is 121660255741. The next prime is 121660255789. The reversal of 121660255778 is 877552066121.

It can be written as a sum of positive squares in 2 ways, for example, as 121196585689 + 463670089 = 348133^2 + 21533^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a Curzon number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1789121375 + ... + 1789121442.

Almost surely, 2^121660255778 is an apocalyptic number.

121660255778 is a deficient number, since it is larger than the sum of its proper divisors (71564856394).

121660255778 is a wasteful number, since it uses less digits than its factorization.

121660255778 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3578242836.

The product of its (nonzero) digits is 1411200, while the sum is 50.

The spelling of 121660255778 in words is "one hundred twenty-one billion, six hundred sixty million, two hundred fifty-five thousand, seven hundred seventy-eight".