8128758878681 has 8 divisors (see below), whose sum is σ = 9291266801664. Its totient is φ = 6966565119360.

The previous prime is 8128758878657. The next prime is 8128758878687. The reversal of 8128758878681 is 1868788578218.

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

It is a de Polignac number, because none of the positive numbers 2^k-8128758878681 is a prime.

It is a super-2 number, since 2×8128758878681² (a number of 27 digits) contains 22 as substring.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (8128758878687) 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 7 ways as a sum of consecutive naturals, for example, 78485465 + ... + 78588966.

It is an arithmetic number, because the mean of its divisors is an integer number (1161408350208).

Almost surely, 2^{8128758878681} is an apocalyptic number.

It is an amenable number.

8128758878681 is a deficient number, since it is larger than the sum of its proper divisors (1162507922983).

8128758878681 is a wasteful number, since it uses less digits than its factorization.

8128758878681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 157081831.

The product of its digits is 770703360, while the sum is 77.

The spelling of 8128758878681 in words is "eight trillion, one hundred twenty-eight billion, seven hundred fifty-eight million, eight hundred seventy-eight thousand, six hundred eighty-one".