856215525 has 48 divisors (see below), whose sum is σ = 1625610240. Its totient is φ = 393278400.

The previous prime is 856215473. The next prime is 856215539. The reversal of 856215525 is 525512658.

It is not a de Polignac number, because 856215525 - 2¹⁶ = 856149989 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 11637 + ... + 42986.

It is an arithmetic number, because the mean of its divisors is an integer number (33866880).

Almost surely, 2^856215525 is an apocalyptic number.

It is an amenable number.

856215525 is a deficient number, since it is larger than the sum of its proper divisors (769394715).

856215525 is a wasteful number, since it uses less digits than its factorization.

856215525 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 54666 (or 54661 counting only the distinct ones).

The product of its digits is 120000, while the sum is 39.

The square root of 856215525 is about 29261.1606912645. The cubic root of 856215525 is about 949.5715611942.

The spelling of 856215525 in words is "eight hundred fifty-six million, two hundred fifteen thousand, five hundred twenty-five".