128271619709 has 8 divisors (see below), whose sum is σ = 128834854200. Its totient is φ = 127708494336.

The previous prime is 128271619703. The next prime is 128271619717. The reversal of 128271619709 is 907916172821.

It can be written as a sum of positive squares in 4 ways, for example, as 21375317209 + 106896302500 = 146203^2 + 326950^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 128271619709 - 2⁸ = 128271619453 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128271619703) 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, 3119717 + ... + 3160565.

It is an arithmetic number, because the mean of its divisors is an integer number (16104356775).

Almost surely, 2^128271619709 is an apocalyptic number.

It is an amenable number.

128271619709 is a deficient number, since it is larger than the sum of its proper divisors (563234491).

128271619709 is a wasteful number, since it uses less digits than its factorization.

128271619709 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54559.

The product of its (nonzero) digits is 762048, while the sum is 53.

The spelling of 128271619709 in words is "one hundred twenty-eight billion, two hundred seventy-one million, six hundred nineteen thousand, seven hundred nine".