128512739741 has 8 divisors (see below), whose sum is σ = 129385107000. Its totient is φ = 127640504320.

The previous prime is 128512739689. The next prime is 128512739777. The reversal of 128512739741 is 147937215821.

It can be written as a sum of positive squares in 4 ways, for example, as 7912814116 + 120599925625 = 88954^2 + 347275^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 128512739741 - 2²⁶ = 128445630877 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a self number, because there is not a number n which added to its sum of digits gives 128512739741.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128512738741) 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, 2671421 + ... + 2719101.

It is an arithmetic number, because the mean of its divisors is an integer number (16173138375).

Almost surely, 2^128512739741 is an apocalyptic number.

It is an amenable number.

128512739741 is a deficient number, since it is larger than the sum of its proper divisors (872367259).

128512739741 is a wasteful number, since it uses less digits than its factorization.

128512739741 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 65919.

The product of its digits is 846720, while the sum is 50.

The spelling of 128512739741 in words is "one hundred twenty-eight billion, five hundred twelve million, seven hundred thirty-nine thousand, seven hundred forty-one".