128265057816 has 128 divisors (see below), whose sum is σ = 372814471680. Its totient is φ = 36015446016.

The previous prime is 128265057799. The next prime is 128265057839. The reversal of 128265057816 is 618750562821.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 4860690 + ... + 4887006.

It is an arithmetic number, because the mean of its divisors is an integer number (2912613060).

Almost surely, 2^128265057816 is an apocalyptic number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128265057816, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (186407235840).

128265057816 is an abundant number, since it is smaller than the sum of its proper divisors (244549413864).

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

128265057816 is a wasteful number, since it uses less digits than its factorization.

128265057816 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26833 (or 26829 counting only the distinct ones).

The product of its (nonzero) digits is 1612800, while the sum is 51.

The spelling of 128265057816 in words is "one hundred twenty-eight billion, two hundred sixty-five million, fifty-seven thousand, eight hundred sixteen".