856128139451 has 6 divisors (see below), whose sum is σ = 927049997340. Its totient is φ = 790272128568.

The previous prime is 856128139397. The next prime is 856128139469. The reversal of 856128139451 is 154931821658.

It is not a de Polignac number, because 856128139451 - 2⁶ = 856128139387 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 856128139393 and 856128139402.

It is not an unprimeable number, because it can be changed into a prime (856128139751) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 2532923321 + ... + 2532923658.

It is an arithmetic number, because the mean of its divisors is an integer number (154508332890).

Almost surely, 2^856128139451 is an apocalyptic number.

856128139451 is a deficient number, since it is larger than the sum of its proper divisors (70921857889).

856128139451 is a wasteful number, since it uses less digits than its factorization.

856128139451 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 5065847005 (or 5065846992 counting only the distinct ones).

The product of its digits is 2073600, while the sum is 53.

The spelling of 856128139451 in words is "eight hundred fifty-six billion, one hundred twenty-eight million, one hundred thirty-nine thousand, four hundred fifty-one".