121125263666 has 16 divisors (see below), whose sum is σ = 198230191488. Its totient is φ = 55049934000.

The previous prime is 121125263629. The next prime is 121125263669. The reversal of 121125263666 is 666362521121.

It is a happy number.

It is not an unprimeable number, because it can be changed into a prime (121125263669) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 171305 + ... + 521148.

It is an arithmetic number, because the mean of its divisors is an integer number (12389386968).

Almost surely, 2^121125263666 is an apocalyptic number.

121125263666 is a deficient number, since it is larger than the sum of its proper divisors (77104927822).

121125263666 is a wasteful number, since it uses less digits than its factorization.

121125263666 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 700417.

The product of its digits is 155520, while the sum is 41.

Adding to 121125263666 its reverse (666362521121), we get a palindrome (787487784787).

The spelling of 121125263666 in words is "one hundred twenty-one billion, one hundred twenty-five million, two hundred sixty-three thousand, six hundred sixty-six".