128945611729 has 16 divisors (see below), whose sum is σ = 142388348544. Its totient is φ = 115795296000.

The previous prime is 128945611727. The next prime is 128945611741. The reversal of 128945611729 is 927116549821.

It is a cyclic number.

It is not a de Polignac number, because 128945611729 - 2¹ = 128945611727 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 128945611729.

It is not an unprimeable number, because it can be changed into a prime (128945611727) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 312427 + ... + 596239.

It is an arithmetic number, because the mean of its divisors is an integer number (8899271784).

Almost surely, 2^128945611729 is an apocalyptic number.

It is an amenable number.

128945611729 is a deficient number, since it is larger than the sum of its proper divisors (13442736815).

128945611729 is a wasteful number, since it uses less digits than its factorization.

128945611729 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 284328.

The product of its digits is 2177280, while the sum is 55.

The spelling of 128945611729 in words is "one hundred twenty-eight billion, nine hundred forty-five million, six hundred eleven thousand, seven hundred twenty-nine".