856871655423 has 32 divisors (see below), whose sum is σ = 1329802513920. Its totient is φ = 480630483840.

The previous prime is 856871655383. The next prime is 856871655457. The reversal of 856871655423 is 324556178658.

It is not a de Polignac number, because 856871655423 - 2¹⁰ = 856871654399 is a prime.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (856871655463) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 328033 + ... + 1349573.

It is an arithmetic number, because the mean of its divisors is an integer number (41556328560).

Almost surely, 2^856871655423 is an apocalyptic number.

856871655423 is a deficient number, since it is larger than the sum of its proper divisors (472930858497).

856871655423 is a wasteful number, since it uses less digits than its factorization.

856871655423 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1022287.

The product of its digits is 48384000, while the sum is 60.

The spelling of 856871655423 in words is "eight hundred fifty-six billion, eight hundred seventy-one million, six hundred fifty-five thousand, four hundred twenty-three".