128571557166 has 192 divisors, whose sum is σ = 314928746496. Its totient is φ = 37641024000.

The previous prime is 128571557143. The next prime is 128571557171. The reversal of 128571557166 is 661755175821.

128571557166 is a `hidden beast` number, since 1 + 2 + 8 + 5 + 7 + 1 + 5 + 571 + 66 = 666.

It is a super-3 number, since 3×128571557166³ (a number of 34 digits) contains 333 as substring.

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 95 ways as a sum of consecutive naturals, for example, 117202330 + ... + 117203426.

It is an arithmetic number, because the mean of its divisors is an integer number (1640253888).

Almost surely, 2^128571557166 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128571557166, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (157464373248).

128571557166 is an abundant number, since it is smaller than the sum of its proper divisors (186357189330).

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

128571557166 is a wasteful number, since it uses less digits than its factorization.

128571557166 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1407 (or 1404 counting only the distinct ones).

The product of its digits is 3528000, while the sum is 54.

The spelling of 128571557166 in words is "one hundred twenty-eight billion, five hundred seventy-one million, five hundred fifty-seven thousand, one hundred sixty-six".