128256356567 has 8 divisors (see below), whose sum is σ = 134854346880. Its totient is φ = 121743501880.

The previous prime is 128256356561. The next prime is 128256356587. The reversal of 128256356567 is 765653652821.

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 128256356567 - 2⁴ = 128256356551 is a prime.

It is a super-3 number, since 3×128256356567³ (a number of 34 digits) contains 333 as substring.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128256356561) 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, 21280817 + ... + 21286842.

It is an arithmetic number, because the mean of its divisors is an integer number (16856793360).

Almost surely, 2^128256356567 is an apocalyptic number.

128256356567 is a deficient number, since it is larger than the sum of its proper divisors (6597990313).

128256356567 is a wasteful number, since it uses less digits than its factorization.

128256356567 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 42567813.

The product of its digits is 18144000, while the sum is 56.

The spelling of 128256356567 in words is "one hundred twenty-eight billion, two hundred fifty-six million, three hundred fifty-six thousand, five hundred sixty-seven".