128938751265 has 32 divisors (see below), whose sum is σ = 207921772800. Its totient is φ = 68228524800.

The previous prime is 128938751257. The next prime is 128938751299. The reversal of 128938751265 is 562157839821.

It is not a de Polignac number, because 128938751265 - 2³ = 128938751257 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 1843351 + ... + 1912019.

It is an arithmetic number, because the mean of its divisors is an integer number (6497555400).

Almost surely, 2^128938751265 is an apocalyptic number.

128938751265 is a gapful number since it is divisible by the number (15) formed by its first and last digit.

It is an amenable number.

128938751265 is a deficient number, since it is larger than the sum of its proper divisors (78983021535).

128938751265 is a wasteful number, since it uses less digits than its factorization.

128938751265 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 69657.

The product of its digits is 7257600, while the sum is 57.

The spelling of 128938751265 in words is "one hundred twenty-eight billion, nine hundred thirty-eight million, seven hundred fifty-one thousand, two hundred sixty-five".