128162215566 has 384 divisors, whose sum is σ = 368769024000. Its totient is φ = 31187566080.

The previous prime is 128162215541. The next prime is 128162215591. The reversal of 128162215566 is 665512261821.

128162215566 is a `hidden beast` number, since 1 + 2 + 8 + 1 + 62 + 21 + 5 + 566 = 666.

It is an interprime number because it is at equal distance from previous prime (128162215541) and next prime (128162215591).

It is a congruent number.

It is an unprimeable number.

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 191 ways as a sum of consecutive naturals, for example, 564591145 + ... + 564591371.

It is an arithmetic number, because the mean of its divisors is an integer number (960336000).

Almost surely, 2^128162215566 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128162215566, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (184384512000).

128162215566 is an abundant number, since it is smaller than the sum of its proper divisors (240606808434).

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

128162215566 is a wasteful number, since it uses less digits than its factorization.

128162215566 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 564 (or 561 counting only the distinct ones).

The product of its digits is 345600, while the sum is 45.

The spelling of 128162215566 in words is "one hundred twenty-eight billion, one hundred sixty-two million, two hundred fifteen thousand, five hundred sixty-six".