128546555919 has 4 divisors (see below), whose sum is σ = 171395407896. Its totient is φ = 85697703944.

The previous prime is 128546555899. The next prime is 128546556053. The reversal of 128546555919 is 919555645821.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is not a de Polignac number, because 128546555919 - 2¹² = 128546551823 is a prime.

It is a super-2 number, since 2×128546555919² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128546555219) 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, 21424425984 + ... + 21424425989.

It is an arithmetic number, because the mean of its divisors is an integer number (42848851974).

Almost surely, 2^128546555919 is an apocalyptic number.

128546555919 is a deficient number, since it is larger than the sum of its proper divisors (42848851977).

128546555919 is an equidigital number, since it uses as much as digits as its factorization.

128546555919 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42848851976.

The product of its digits is 19440000, while the sum is 60.

The spelling of 128546555919 in words is "one hundred twenty-eight billion, five hundred forty-six million, five hundred fifty-five thousand, nine hundred nineteen".