8128811757538 has 8 divisors (see below), whose sum is σ = 12423278346588. Its totient is φ = 3987718975344.

The previous prime is 8128811757529. The next prime is 8128811757541. The reversal of 8128811757538 is 8357571188218.

It can be written as a sum of positive squares in 2 ways, for example, as 7995282173649 + 133529583889 = 2827593^2 + 365417^2 .

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

It is a self number, because there is not a number n which added to its sum of digits gives 8128811757538.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 38343451581 + ... + 38343451792.

Almost surely, 2^{8128811757538} is an apocalyptic number.

8128811757538 is a deficient number, since it is larger than the sum of its proper divisors (4294466589050).

8128811757538 is a wasteful number, since it uses less digits than its factorization.

8128811757538 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 76686903428.

The product of its digits is 30105600, while the sum is 64.

The spelling of 8128811757538 in words is "eight trillion, one hundred twenty-eight billion, eight hundred eleven million, seven hundred fifty-seven thousand, five hundred thirty-eight".