166128125325 has 48 divisors (see below), whose sum is σ = 283266441216. Its totient is φ = 85859524800.

The previous prime is 166128125297. The next prime is 166128125389. The reversal of 166128125325 is 523521821661.

It is not a de Polignac number, because 166128125325 - 2¹⁰ = 166128124301 is a prime.

It is a hoax number, since the sum of its digits (42) coincides with the sum of the digits of its distinct prime factors.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 206770 + ... + 612380.

It is an arithmetic number, because the mean of its divisors is an integer number (5901384192).

Almost surely, 2^166128125325 is an apocalyptic number.

166128125325 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

166128125325 is a deficient number, since it is larger than the sum of its proper divisors (117138315891).

166128125325 is a wasteful number, since it uses less digits than its factorization.

166128125325 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 405794 (or 405789 counting only the distinct ones).

The product of its digits is 172800, while the sum is 42.

Adding to 166128125325 its reverse (523521821661), we get a palindrome (689649946986).

The spelling of 166128125325 in words is "one hundred sixty-six billion, one hundred twenty-eight million, one hundred twenty-five thousand, three hundred twenty-five".