121662666 has 24 divisors (see below), whose sum is σ = 268578180. Its totient is φ = 39788736.

The previous prime is 121662637. The next prime is 121662677. The reversal of 121662666 is 666266121.

It is a happy number.

It can be written as a sum of positive squares in 2 ways, for example, as 120890025 + 772641 = 10995^2 + 879^2 .

It is a nude number because it is divisible by every one of its digits.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 121662666.

It is an unprimeable number.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 62811 + ... + 64718.

Almost surely, 2^121662666 is an apocalyptic number.

121662666 is an abundant number, since it is smaller than the sum of its proper divisors (146915514).

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

121662666 is a wasteful number, since it uses less digits than its factorization.

121662666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 127590 (or 127587 counting only the distinct ones).

The product of its digits is 31104, while the sum is 36.

The square root of 121662666 is about 11030.0800541066. The cubic root of 121662666 is about 495.5100222225.

The spelling of 121662666 in words is "one hundred twenty-one million, six hundred sixty-two thousand, six hundred sixty-six".