128205512642 has 16 divisors (see below), whose sum is σ = 194586144480. Its totient is φ = 63344332128.

The previous prime is 128205512641. The next prime is 128205512647. The reversal of 128205512642 is 246215502821.

It is a junction number, because it is equal to n+sod(n) for n = 128205512596 and 128205512605.

It is not an unprimeable number, because it can be changed into a prime (128205512641) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 80693 + ... + 512759.

It is an arithmetic number, because the mean of its divisors is an integer number (12161634030).

Almost surely, 2^128205512642 is an apocalyptic number.

128205512642 is a deficient number, since it is larger than the sum of its proper divisors (66380631838).

128205512642 is a wasteful number, since it uses less digits than its factorization.

128205512642 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 433825.

The product of its (nonzero) digits is 76800, while the sum is 38.

The spelling of 128205512642 in words is "one hundred twenty-eight billion, two hundred five million, five hundred twelve thousand, six hundred forty-two".