128159980242 has 256 divisors, whose sum is σ = 330515251200. Its totient is φ = 32291550720.

The previous prime is 128159980237. The next prime is 128159980279. The reversal of 128159980242 is 242089951821.

It is an unprimeable number.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 109444317 + ... + 109445487.

It is an arithmetic number, because the mean of its divisors is an integer number (1291075200).

Almost surely, 2^128159980242 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 128159980242, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (165257625600).

128159980242 is an abundant number, since it is smaller than the sum of its proper divisors (202355270958).

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

128159980242 is a wasteful number, since it uses less digits than its factorization.

128159980242 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1381.

The product of its (nonzero) digits is 829440, while the sum is 51.

The spelling of 128159980242 in words is "one hundred twenty-eight billion, one hundred fifty-nine million, nine hundred eighty thousand, two hundred forty-two".