125543166 has 64 divisors (see below), whose sum is σ = 293652480. Its totient is φ = 35043840.

The previous prime is 125543161. The next prime is 125543191. The reversal of 125543166 is 661345521.

It is a super-2 number, since 2×125543166² = 31522173058607112, which contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (125543161) 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, 520806 + ... + 521046.

It is an arithmetic number, because the mean of its divisors is an integer number (4588320).

Almost surely, 2^125543166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 125543166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (146826240).

125543166 is an abundant number, since it is smaller than the sum of its proper divisors (168109314).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

125543166 is a wasteful number, since it uses less digits than its factorization.

125543166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 489.

The product of its digits is 21600, while the sum is 33.

The square root of 125543166 is about 11204.6046784347. The cubic root of 125543166 is about 500.7231748653.

Adding to 125543166 its reverse (661345521), we get a palindrome (786888687).

The spelling of 125543166 in words is "one hundred twenty-five million, five hundred forty-three thousand, one hundred sixty-six".