166021203521013 has 16 divisors (see below), whose sum is σ = 222809930112000. Its totient is φ = 109958146744320.

The previous prime is 166021203521003. The next prime is 166021203521021. The reversal of 166021203521013 is 310125302120661.

It is not a de Polignac number, because 166021203521013 - 2⁴⁰ = 164921691893237 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (166021203521003) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 187947088 + ... + 188828361.

It is an arithmetic number, because the mean of its divisors is an integer number (13925620632000).

Almost surely, 2^{166021203521013} is an apocalyptic number.

It is an amenable number.

166021203521013 is a deficient number, since it is larger than the sum of its proper divisors (56788726590987).

166021203521013 is a wasteful number, since it uses less digits than its factorization.

166021203521013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 376776412.

The product of its (nonzero) digits is 12960, while the sum is 33.

Adding to 166021203521013 its reverse (310125302120661), we get a palindrome (476146505641674).

The spelling of 166021203521013 in words is "one hundred sixty-six trillion, twenty-one billion, two hundred three million, five hundred twenty-one thousand, thirteen".