121666334590589 has 16 divisors (see below), whose sum is σ = 123886266163200. Its totient is φ = 119465222922864.

The previous prime is 121666334590561. The next prime is 121666334590639. The reversal of 121666334590589 is 985095433666121.

It is a cyclic number.

It is not a de Polignac number, because 121666334590589 - 2⁴⁰ = 120566822962813 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121666334580589) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 4563914 + ... + 16253060.

It is an arithmetic number, because the mean of its divisors is an integer number (7742891635200).

Almost surely, 2^{121666334590589} is an apocalyptic number.

It is an amenable number.

121666334590589 is a deficient number, since it is larger than the sum of its proper divisors (2219931572611).

121666334590589 is a wasteful number, since it uses less digits than its factorization.

121666334590589 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 11689952.

The product of its (nonzero) digits is 251942400, while the sum is 68.

The spelling of 121666334590589 in words is "one hundred twenty-one trillion, six hundred sixty-six billion, three hundred thirty-four million, five hundred ninety thousand, five hundred eighty-nine".