128813149619856 has 100 divisors (see below), whose sum is σ = 401501290362172. Its totient is φ = 39634815262464.

The previous prime is 128813149619851. The next prime is 128813149619899. The reversal of 128813149619856 is 658916941318821.

128813149619856 is a `hidden beast` number, since 1 + 2 + 8 + 81 + 3 + 1 + 496 + 1 + 9 + 8 + 56 = 666.

It can be written as a sum of positive squares in 2 ways, for example, as 55414863021456 + 73398286598400 = 7444116^2 + 8567280^2 .

It is a Harshad number since it is a multiple of its sum of digits (72).

It is not an unprimeable number, because it can be changed into a prime (128813149619851) by changing a digit.

It is a polite number, since it can be written in 19 ways as a sum of consecutive naturals, for example, 3822785551 + ... + 3822819246.

Almost surely, 2^{128813149619856} is an apocalyptic number.

128813149619856 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

It is an amenable number.

128813149619856 is an abundant number, since it is smaller than the sum of its proper divisors (272688140742316).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

128813149619856 is a wasteful number, since it uses less digits than its factorization.

128813149619856 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 7645604830 (or 7645604815 counting only the distinct ones).

The product of its digits is 179159040, while the sum is 72.

The spelling of 128813149619856 in words is "one hundred twenty-eight trillion, eight hundred thirteen billion, one hundred forty-nine million, six hundred nineteen thousand, eight hundred fifty-six".