656603 has 2 divisors, whose sum is σ = 656604. Its totient is φ = 656602.

The previous prime is 656599. The next prime is 656609. The reversal of 656603 is 306656.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 656603 - 2² = 656599 is a prime.

It is a super-2 number, since 2×656603² = 862254999218, which contains 22 as substring.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (656609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 328301 + 328302.

It is an arithmetic number, because the mean of its divisors is an integer number (328302).

2⁶⁵⁶⁶⁰³ is an apocalyptic number.

656603 is a deficient number, since it is larger than the sum of its proper divisors (1).

656603 is an equidigital number, since it uses as much as digits as its factorization.

656603 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3240, while the sum is 26.

The square root of 656603 is about 810.3104343398. The cubic root of 656603 is about 86.9162447566.

The spelling of 656603 in words is "six hundred fifty-six thousand, six hundred three".