128043342501 has 4 divisors (see below), whose sum is σ = 170724456672. Its totient is φ = 85362228332.

The previous prime is 128043342499. The next prime is 128043342541. The reversal of 128043342501 is 105243340821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128043342501 - 2¹ = 128043342499 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128043342541) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21340557081 + ... + 21340557086.

It is an arithmetic number, because the mean of its divisors is an integer number (42681114168).

Almost surely, 2^128043342501 is an apocalyptic number.

It is an amenable number.

128043342501 is a deficient number, since it is larger than the sum of its proper divisors (42681114171).

128043342501 is an equidigital number, since it uses as much as digits as its factorization.

128043342501 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42681114170.

The product of its (nonzero) digits is 23040, while the sum is 33.

The spelling of 128043342501 in words is "one hundred twenty-eight billion, forty-three million, three hundred forty-two thousand, five hundred one".