656659 has 12 divisors (see below), whose sum is σ = 740664. Its totient is φ = 580032.

The previous prime is 656657. The next prime is 656671. The reversal of 656659 is 956656.

It is a happy number.

It is not a de Polignac number, because 656659 - 2¹ = 656657 is a prime.

It is a d-powerful number, because it can be written as 6³ + 5 + 6³ + 6⁶ + 5⁷ + 9⁶ .

It is a Duffinian number.

Its product of digits (48600) is a multiple of the sum of its prime factors (162).

It is not an unprimeable number, because it can be changed into a prime (656651) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (7) of ones.

It is a polite number, since it can be written in 11 ways as a sum of consecutive naturals, for example, 6084 + ... + 6190.

It is an arithmetic number, because the mean of its divisors is an integer number (61722).

2⁶⁵⁶⁶⁵⁹ is an apocalyptic number.

656659 is a deficient number, since it is larger than the sum of its proper divisors (84005).

656659 is a wasteful number, since it uses less digits than its factorization.

656659 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 162 (or 143 counting only the distinct ones).

The product of its digits is 48600, while the sum is 37.

The square root of 656659 is about 810.3449882612. The cubic root of 656659 is about 86.9187156415.

It can be divided in two parts, 65 and 6659, that added together give a square (6724 = 82²).

The spelling of 656659 in words is "six hundred fifty-six thousand, six hundred fifty-nine".