856979613543 has 4 divisors (see below), whose sum is σ = 1142639484728. Its totient is φ = 571319742360.

The previous prime is 856979613527. The next prime is 856979613547. The reversal of 856979613543 is 345316979658.

It is a semiprime because it is the product of two primes.

It is not a de Polignac number, because 856979613543 - 2⁴ = 856979613527 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856979613547) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 142829935588 + ... + 142829935593.

It is an arithmetic number, because the mean of its divisors is an integer number (285659871182).

Almost surely, 2^856979613543 is an apocalyptic number.

856979613543 is a deficient number, since it is larger than the sum of its proper divisors (285659871185).

856979613543 is a wasteful number, since it uses less digits than its factorization.

856979613543 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 285659871184.

The product of its digits is 146966400, while the sum is 66.

The spelling of 856979613543 in words is "eight hundred fifty-six billion, nine hundred seventy-nine million, six hundred thirteen thousand, five hundred forty-three".