128651166 has 120 divisors (see below), whose sum is σ = 353402280. Its totient is φ = 34782048.

The previous prime is 128651143. The next prime is 128651177. The reversal of 128651166 is 661156821.

128651166 is a `hidden beast` number, since 1 + 2 + 86 + 511 + 66 = 666.

It is a super-2 number, since 2×128651166² = 33102245026319112, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 128651166.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 59 ways as a sum of consecutive naturals, for example, 150396 + ... + 151248.

It is an arithmetic number, because the mean of its divisors is an integer number (2945019).

Almost surely, 2^128651166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128651166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (176701140).

128651166 is an abundant number, since it is smaller than the sum of its proper divisors (224751114).

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

128651166 is a wasteful number, since it uses less digits than its factorization.

128651166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 900 (or 884 counting only the distinct ones).

The product of its digits is 17280, while the sum is 36.

The square root of 128651166 is about 11342.4497353967. The cubic root of 128651166 is about 504.8215766766.

The spelling of 128651166 in words is "one hundred twenty-eight million, six hundred fifty-one thousand, one hundred sixty-six".