128645181546821 has 8 divisors (see below), whose sum is σ = 128786062368000. Its totient is φ = 128504302677360.

The previous prime is 128645181546811. The next prime is 128645181546823.

128645181546821 is nontrivially palindromic in base 10.

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-128645181546821 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 (128645181546823) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 160416755 + ... + 161216703.

It is an arithmetic number, because the mean of its divisors is an integer number (16098257796000).

Almost surely, 2^{128645181546821} is an apocalyptic number.

It is an amenable number.

128645181546821 is a deficient number, since it is larger than the sum of its proper divisors (140880821179).

128645181546821 is an equidigital number, since it uses as much as digits as its factorization.

128645181546821 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 975859.

The product of its digits is 29491200, while the sum is 62.

The spelling of 128645181546821 in words is "one hundred twenty-eight trillion, six hundred forty-five billion, one hundred eighty-one million, five hundred forty-six thousand, eight hundred twenty-one".