166205662205125 has 64 divisors (see below), whose sum is σ = 222752907546624. Its totient is φ = 123372337766400.

The previous prime is 166205662205053. The next prime is 166205662205147. The reversal of 166205662205125 is 521502266502661.

It is not a de Polignac number, because 166205662205125 - 2⁷ = 166205662204997 is a prime.

It is a Duffinian number.

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 63 ways as a sum of consecutive naturals, for example, 47106517 + ... + 50511733.

It is an arithmetic number, because the mean of its divisors is an integer number (3480514180416).

Almost surely, 2^{166205662205125} is an apocalyptic number.

It is an amenable number.

166205662205125 is a deficient number, since it is larger than the sum of its proper divisors (56547245341499).

166205662205125 is a wasteful number, since it uses less digits than its factorization.

166205662205125 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3405575 (or 3405565 counting only the distinct ones).

The product of its (nonzero) digits is 2592000, while the sum is 49.

The spelling of 166205662205125 in words is "one hundred sixty-six trillion, two hundred five billion, six hundred sixty-two million, two hundred five thousand, one hundred twenty-five".