128320121215885 has 8 divisors (see below), whose sum is σ = 159293943578520. Its totient is φ = 99116231559744.

The previous prime is 128320121215883. The next prime is 128320121215901. The reversal of 128320121215885 is 588512121023821.

It can be written as a sum of positive squares in 4 ways, for example, as 482862383689 + 127837258832196 = 694883^2 + 11306514^2 .

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

It is a cyclic number.

It is not a de Polignac number, because 128320121215885 - 2¹ = 128320121215883 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128320121215883) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 442483176462 + ... + 442483176751.

It is an arithmetic number, because the mean of its divisors is an integer number (19911742947315).

Almost surely, 2^{128320121215885} is an apocalyptic number.

It is an amenable number.

128320121215885 is a deficient number, since it is larger than the sum of its proper divisors (30973822362635).

128320121215885 is an equidigital number, since it uses as much as digits as its factorization.

128320121215885 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 884966353247.

The product of its (nonzero) digits is 614400, while the sum is 49.

The spelling of 128320121215885 in words is "one hundred twenty-eight trillion, three hundred twenty billion, one hundred twenty-one million, two hundred fifteen thousand, eight hundred eighty-five".