856663225 has 24 divisors (see below), whose sum is σ = 1187111520. Its totient is φ = 607824000.

The previous prime is 856663217. The next prime is 856663229. The reversal of 856663225 is 522366658.

It is a happy number.

It is not a de Polignac number, because 856663225 - 2³ = 856663217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (856663229) by changing a digit.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 26715 + ... + 49264.

It is an arithmetic number, because the mean of its divisors is an integer number (49462980).

Almost surely, 2^856663225 is an apocalyptic number.

It is an amenable number.

856663225 is a deficient number, since it is larger than the sum of its proper divisors (330448295).

856663225 is a wasteful number, since it uses less digits than its factorization.

856663225 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 76041 (or 76036 counting only the distinct ones).

The product of its digits is 518400, while the sum is 43.

The square root of 856663225 is about 29268.8097639791. The cubic root of 856663225 is about 949.7370370977.

The spelling of 856663225 in words is "eight hundred fifty-six million, six hundred sixty-three thousand, two hundred twenty-five".