656168825 has 12 divisors (see below), whose sum is σ = 876238188. Its totient is φ = 484555200.

The previous prime is 656168809. The next prime is 656168861. The reversal of 656168825 is 528861656.

It is a happy number.

It can be written as a sum of positive squares in 6 ways, for example, as 14661241 + 641507584 = 3829^2 + 25328^2 .

It is not a de Polignac number, because 656168825 - 2⁴ = 656168809 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 656168825.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 1009166 + ... + 1009815.

It is an arithmetic number, because the mean of its divisors is an integer number (73019849).

Almost surely, 2^656168825 is an apocalyptic number.

656168825 is a gapful number since it is divisible by the number (65) formed by its first and last digit.

It is an amenable number.

656168825 is a deficient number, since it is larger than the sum of its proper divisors (220069363).

656168825 is a wasteful number, since it uses less digits than its factorization.

656168825 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2019004 (or 2018999 counting only the distinct ones).

The product of its digits is 691200, while the sum is 47.

The square root of 656168825 is about 25615.7924921327. The cubic root of 656168825 is about 868.9708290822.

The spelling of 656168825 in words is "six hundred fifty-six million, one hundred sixty-eight thousand, eight hundred twenty-five".