856871506225 has 24 divisors (see below), whose sum is σ = 1214351780480. Its totient is φ = 587548494720.

The previous prime is 856871506187. The next prime is 856871506273. The reversal of 856871506225 is 522605178658.

It is not a de Polignac number, because 856871506225 - 2¹³ = 856871498033 is a prime.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 6287356 + ... + 6422194.

Almost surely, 2^856871506225 is an apocalyptic number.

It is an amenable number.

856871506225 is a deficient number, since it is larger than the sum of its proper divisors (357480274255).

856871506225 is a wasteful number, since it uses less digits than its factorization.

856871506225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 171169 (or 171164 counting only the distinct ones).

The product of its (nonzero) digits is 8064000, while the sum is 55.

The spelling of 856871506225 in words is "eight hundred fifty-six billion, eight hundred seventy-one million, five hundred six thousand, two hundred twenty-five".