128387355267 has 4 divisors (see below), whose sum is σ = 171183140360. Its totient is φ = 85591570176.

The previous prime is 128387355263. The next prime is 128387355281. The reversal of 128387355267 is 762553783821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 762553783821 = 3 ⋅254184594607.

It is not a de Polignac number, because 128387355267 - 2² = 128387355263 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128387355263) 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, 21397892542 + ... + 21397892547.

It is an arithmetic number, because the mean of its divisors is an integer number (42795785090).

Almost surely, 2^128387355267 is an apocalyptic number.

128387355267 is a deficient number, since it is larger than the sum of its proper divisors (42795785093).

128387355267 is an equidigital number, since it uses as much as digits as its factorization.

128387355267 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42795785092.

The product of its digits is 16934400, while the sum is 57.

The spelling of 128387355267 in words is "one hundred twenty-eight billion, three hundred eighty-seven million, three hundred fifty-five thousand, two hundred sixty-seven".