128378819755 has 4 divisors (see below), whose sum is σ = 154054583712. Its totient is φ = 102703055800.

The previous prime is 128378819731. The next prime is 128378819813. The reversal of 128378819755 is 557918873821.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 557918873821 = 877 ⋅636167473.

It is not a de Polignac number, because 128378819755 - 2³¹ = 126231336107 is a prime.

It is a super-2 number, since 2×128378819755² (a number of 23 digits) contains 22 as substring.

It is a Duffinian number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12837881971 + ... + 12837881980.

It is an arithmetic number, because the mean of its divisors is an integer number (38513645928).

Almost surely, 2^128378819755 is an apocalyptic number.

128378819755 is a deficient number, since it is larger than the sum of its proper divisors (25675763957).

128378819755 is an equidigital number, since it uses as much as digits as its factorization.

128378819755 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25675763956.

The product of its digits is 33868800, while the sum is 64.

The spelling of 128378819755 in words is "one hundred twenty-eight billion, three hundred seventy-eight million, eight hundred nineteen thousand, seven hundred fifty-five".