128177640217 has 16 divisors (see below), whose sum is σ = 146083875840. Its totient is φ = 111325786000.

The previous prime is 128177640209. The next prime is 128177640223. The reversal of 128177640217 is 712046771821.

It is not a de Polignac number, because 128177640217 - 2³ = 128177640209 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (128177640317) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 89659 + ... + 514192.

It is an arithmetic number, because the mean of its divisors is an integer number (9130242240).

Almost surely, 2^128177640217 is an apocalyptic number.

It is an amenable number.

128177640217 is a deficient number, since it is larger than the sum of its proper divisors (17906235623).

128177640217 is a wasteful number, since it uses less digits than its factorization.

128177640217 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 604724.

The product of its (nonzero) digits is 263424, while the sum is 46.

The spelling of 128177640217 in words is "one hundred twenty-eight billion, one hundred seventy-seven million, six hundred forty thousand, two hundred seventeen".