128450512511 has 4 divisors (see below), whose sum is σ = 128757077400. Its totient is φ = 128143947624.

The previous prime is 128450512459. The next prime is 128450512523. The reversal of 128450512511 is 115215054821.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 115215054821 = 71 ⋅1622747251.

It is a cyclic number.

It is not a de Polignac number, because 128450512511 - 2¹⁰ = 128450511487 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 (128450515511) 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, 153281816 + ... + 153282653.

It is an arithmetic number, because the mean of its divisors is an integer number (32189269350).

Almost surely, 2^128450512511 is an apocalyptic number.

128450512511 is a deficient number, since it is larger than the sum of its proper divisors (306564889).

128450512511 is an equidigital number, since it uses as much as digits as its factorization.

128450512511 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 306564888.

The product of its (nonzero) digits is 16000, while the sum is 35.

The spelling of 128450512511 in words is "one hundred twenty-eight billion, four hundred fifty million, five hundred twelve thousand, five hundred eleven".