166325520445205 has 16 divisors (see below), whose sum is σ = 217736020833408. Its totient is φ = 120963573720000.

The previous prime is 166325520445157. The next prime is 166325520445237. The reversal of 166325520445205 is 502544025523661.

It is a happy number.

It is not a de Polignac number, because 166325520445205 - 2⁴² = 161927473934101 is a prime.

It is a super-2 number, since 2×166325520445205² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 10102280 + ... + 20849630.

It is an arithmetic number, because the mean of its divisors is an integer number (13608501302088).

Almost surely, 2^{166325520445205} is an apocalyptic number.

It is an amenable number.

166325520445205 is a deficient number, since it is larger than the sum of its proper divisors (51410500388203).

166325520445205 is a wasteful number, since it uses less digits than its factorization.

166325520445205 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 11028748.

The product of its (nonzero) digits is 8640000, while the sum is 50.

Adding to 166325520445205 its reverse (502544025523661), we get a palindrome (668869545968866).

The spelling of 166325520445205 in words is "one hundred sixty-six trillion, three hundred twenty-five billion, five hundred twenty million, four hundred forty-five thousand, two hundred five".