121644666 has 160 divisors (see below), whose sum is σ = 329313600. Its totient is φ = 33073920.

The previous prime is 121644659. The next prime is 121644671. The reversal of 121644666 is 666446121.

It is a self number, because there is not a number n which added to its sum of digits gives 121644666.

It is an unprimeable number.

It is a polite number, since it can be written in 79 ways as a sum of consecutive naturals, for example, 1366750 + ... + 1366838.

It is an arithmetic number, because the mean of its divisors is an integer number (2058210).

Almost surely, 2^121644666 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 121644666, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (164656800).

121644666 is an abundant number, since it is smaller than the sum of its proper divisors (207668934).

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

121644666 is a wasteful number, since it uses less digits than its factorization.

121644666 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 186 (or 177 counting only the distinct ones).

The product of its digits is 41472, while the sum is 36.

The square root of 121644666 is about 11029.2640733641. The cubic root of 121644666 is about 495.4855841030.

The spelling of 121644666 in words is "one hundred twenty-one million, six hundred forty-four thousand, six hundred sixty-six".