656168 has 8 divisors (see below), whose sum is σ = 1230330. Its totient is φ = 328080.

The previous prime is 656153. The next prime is 656171. The reversal of 656168 is 861656.

Added to its reverse (861656) it gives a square (1517824 = 1232²).

It can be written as a sum of positive squares in only one way, i.e., 362404 + 293764 = 602^2 + 542^2 .

It is a tau number, because it is divible by the number of its divisors (8).

It is an Ulam number.

It is a plaindrome in base 12.

It is an unprimeable number.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 41003 + ... + 41018.

2⁶⁵⁶¹⁶⁸ is an apocalyptic number.

It is an amenable number.

656168 is a deficient number, since it is larger than the sum of its proper divisors (574162).

656168 is a wasteful number, since it uses less digits than its factorization.

656168 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 82027 (or 82023 counting only the distinct ones).

The product of its digits is 8640, while the sum is 32.

The square root of 656168 is about 810.0419742211. The cubic root of 656168 is about 86.8970464897.

Adding to 656168 its reverse (861656), we get a square (1517824 = 1232²).

The spelling of 656168 in words is "six hundred fifty-six thousand, one hundred sixty-eight".