128813149619855 has 4 divisors (see below), whose sum is σ = 154575779543832. Its totient is φ = 103050519695880.

The previous prime is 128813149619851. The next prime is 128813149619899. The reversal of 128813149619855 is 558916941318821.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 128813149619855 - 2² = 128813149619851 is a prime.

It is a Duffinian number.

It is a congruent number.

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

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, 12881314961981 + ... + 12881314961990.

It is an arithmetic number, because the mean of its divisors is an integer number (38643944885958).

Almost surely, 2^{128813149619855} is an apocalyptic number.

128813149619855 is a deficient number, since it is larger than the sum of its proper divisors (25762629923977).

128813149619855 is an equidigital number, since it uses as much as digits as its factorization.

128813149619855 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 25762629923976.

The product of its digits is 149299200, while the sum is 71.

The spelling of 128813149619855 in words is "one hundred twenty-eight trillion, eight hundred thirteen billion, one hundred forty-nine million, six hundred nineteen thousand, eight hundred fifty-five".