128317043344865 has 16 divisors (see below), whose sum is σ = 154122890524416. Its totient is φ = 102558679104000.

The previous prime is 128317043344793. The next prime is 128317043344873. The reversal of 128317043344865 is 568443340713821.

It is a happy number.

It is not a de Polignac number, because 128317043344865 - 2¹⁸ = 128317043082721 is a prime.

It is a super-3 number, since 3×128317043344865³ (a number of 43 digits) contains 333 as substring. Note that it is a super-d number also for d = 2.

It is a Duffinian number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 351900890 + ... + 352265340.

It is an arithmetic number, because the mean of its divisors is an integer number (9632680657776).

Almost surely, 2^{128317043344865} is an apocalyptic number.

It is an amenable number.

128317043344865 is a deficient number, since it is larger than the sum of its proper divisors (25805847179551).

128317043344865 is a wasteful number, since it uses less digits than its factorization.

128317043344865 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 429400.

The product of its (nonzero) digits is 46448640, while the sum is 59.

The spelling of 128317043344865 in words is "one hundred twenty-eight trillion, three hundred seventeen billion, forty-three million, three hundred forty-four thousand, eight hundred sixty-five".