128351863685013 has 4 divisors (see below), whose sum is σ = 171135818246688. Its totient is φ = 85567909123340.

The previous prime is 128351863684999. The next prime is 128351863685021. The reversal of 128351863685013 is 310586368153821.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 128351863685013 - 2⁹ = 128351863684501 is a prime.

It is a super-2 number, since 2×128351863685013² (a number of 29 digits) contains 22 as substring.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (128351863685813) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 21391977280833 + ... + 21391977280838.

It is an arithmetic number, because the mean of its divisors is an integer number (42783954561672).

Almost surely, 2^{128351863685013} is an apocalyptic number.

It is an amenable number.

128351863685013 is a deficient number, since it is larger than the sum of its proper divisors (42783954561675).

128351863685013 is an equidigital number, since it uses as much as digits as its factorization.

128351863685013 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 42783954561674.

The product of its (nonzero) digits is 24883200, while the sum is 60.

The spelling of 128351863685013 in words is "one hundred twenty-eight trillion, three hundred fifty-one billion, eight hundred sixty-three million, six hundred eighty-five thousand, thirteen".