16566122117121 has 32 divisors (see below), whose sum is σ = 23747119349760. Its totient is φ = 10239456594816.

The previous prime is 16566122117101. The next prime is 16566122117123. The reversal of 16566122117121 is 12171122166561.

It is not a de Polignac number, because 16566122117121 - 2⁵ = 16566122117089 is a prime.

It is not an unprimeable number, because it can be changed into a prime (16566122117123) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 37842925 + ... + 38278181.

It is an arithmetic number, because the mean of its divisors is an integer number (742097479680).

Almost surely, 2^{16566122117121} is an apocalyptic number.

It is an amenable number.

16566122117121 is a deficient number, since it is larger than the sum of its proper divisors (7180997232639).

16566122117121 is a wasteful number, since it uses less digits than its factorization.

16566122117121 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 449533.

The product of its digits is 60480, while the sum is 42.

The spelling of 16566122117121 in words is "sixteen trillion, five hundred sixty-six billion, one hundred twenty-two million, one hundred seventeen thousand, one hundred twenty-one".