857123534343 has 4 divisors (see below), whose sum is σ = 1142831379128. Its totient is φ = 571415689560.

The previous prime is 857123534287. The next prime is 857123534353. The reversal of 857123534343 is 343435321758.

It is a happy number.

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

It is not a de Polignac number, because 857123534343 - 2⁶ = 857123534279 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 857123534292 and 857123534301.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (857123534353) 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, 142853922388 + ... + 142853922393.

It is an arithmetic number, because the mean of its divisors is an integer number (285707844782).

Almost surely, 2^857123534343 is an apocalyptic number.

857123534343 is a deficient number, since it is larger than the sum of its proper divisors (285707844785).

857123534343 is a wasteful number, since it uses less digits than its factorization.

857123534343 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 285707844784.

The product of its digits is 3628800, while the sum is 48.

The spelling of 857123534343 in words is "eight hundred fifty-seven billion, one hundred twenty-three million, five hundred thirty-four thousand, three hundred forty-three".