121616611853 has 4 divisors (see below), whose sum is σ = 132672667488. Its totient is φ = 110560556220.

The previous prime is 121616611817. The next prime is 121616611877. The reversal of 121616611853 is 358116616121.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 358116616121 = 11 ⋅32556056011.

It is a cyclic number.

It is not a de Polignac number, because 121616611853 - 2¹⁴ = 121616595469 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 121616611853.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (121616611553) 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 3 ways as a sum of consecutive naturals, for example, 5528027801 + ... + 5528027822.

It is an arithmetic number, because the mean of its divisors is an integer number (33168166872).

Almost surely, 2^121616611853 is an apocalyptic number.

It is an amenable number.

121616611853 is a deficient number, since it is larger than the sum of its proper divisors (11056055635).

121616611853 is a wasteful number, since it uses less digits than its factorization.

121616611853 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11056055634.

The product of its digits is 51840, while the sum is 41.

The spelling of 121616611853 in words is "one hundred twenty-one billion, six hundred sixteen million, six hundred eleven thousand, eight hundred fifty-three".