128557980694 has 64 divisors (see below), whose sum is σ = 229057803072. Its totient is φ = 53344512000.

The previous prime is 128557980653. The next prime is 128557980697. The reversal of 128557980694 is 496089755821.

It is a happy number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128557980697) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 31685914 + ... + 31689970.

It is an arithmetic number, because the mean of its divisors is an integer number (3579028173).

Almost surely, 2^128557980694 is an apocalyptic number.

128557980694 is a deficient number, since it is larger than the sum of its proper divisors (100499822378).

128557980694 is a wasteful number, since it uses less digits than its factorization.

128557980694 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 5281.

The product of its (nonzero) digits is 43545600, while the sum is 64.

The spelling of 128557980694 in words is "one hundred twenty-eight billion, five hundred fifty-seven million, nine hundred eighty thousand, six hundred ninety-four".