121125666 has 16 divisors (see below), whose sum is σ = 242754624. Its totient is φ = 40291344.

The previous prime is 121125619. The next prime is 121125677. The reversal of 121125666 is 666521121.

It is an unprimeable number.

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 7 ways as a sum of consecutive naturals, for example, 17805 + ... + 23648.

It is an arithmetic number, because the mean of its divisors is an integer number (15172164).

Almost surely, 2^121125666 is an apocalyptic number.

121125666 is an abundant number, since it is smaller than the sum of its proper divisors (121628958).

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

121125666 is a wasteful number, since it uses less digits than its factorization.

121125666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 41945.

The product of its digits is 4320, while the sum is 30.

The square root of 121125666 is about 11005.7106085886. The cubic root of 121125666 is about 494.7799123618.

Adding to 121125666 its reverse (666521121), we get a palindrome (787646787).

The spelling of 121125666 in words is "one hundred twenty-one million, one hundred twenty-five thousand, six hundred sixty-six".