128123166 has 8 divisors (see below), whose sum is σ = 256246344. Its totient is φ = 42707720.

The previous prime is 128123153. The next prime is 128123167. The reversal of 128123166 is 661321821.

It is a sphenic number, since it is the product of 3 distinct primes.

128123166 is an admirable number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128123167) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 10676925 + ... + 10676936.

It is an arithmetic number, because the mean of its divisors is an integer number (32030793).

Almost surely, 2^128123166 is an apocalyptic number.

128123166 is a primitive abundant number, since it is smaller than the sum of its proper divisors, none of which is abundant.

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

128123166 is a wasteful number, since it uses less digits than its factorization.

128123166 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 21353866.

The product of its digits is 3456, while the sum is 30.

The square root of 128123166 is about 11319.1504098143. The cubic root of 128123166 is about 504.1300133846.

Adding to 128123166 its reverse (661321821), we get a palindrome (789444987).

The spelling of 128123166 in words is "one hundred twenty-eight million, one hundred twenty-three thousand, one hundred sixty-six".