121616106661 has 16 divisors (see below), whose sum is σ = 146961203200. Its totient is φ = 98313060528.

The previous prime is 121616106649. The next prime is 121616106757. The reversal of 121616106661 is 166601616121.

It is a cyclic number.

It is not a de Polignac number, because 121616106661 - 2⁵ = 121616106629 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 121616106661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121616104661) 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, 2020581 + ... + 2079898.

It is an arithmetic number, because the mean of its divisors is an integer number (9185075200).

Almost surely, 2^121616106661 is an apocalyptic number.

It is an amenable number.

121616106661 is a deficient number, since it is larger than the sum of its proper divisors (25345096539).

121616106661 is a wasteful number, since it uses less digits than its factorization.

121616106661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 4100728.

The product of its (nonzero) digits is 15552, while the sum is 37.

The spelling of 121616106661 in words is "one hundred twenty-one billion, six hundred sixteen million, one hundred six thousand, six hundred sixty-one".