655643 has 2 divisors, whose sum is σ = 655644. Its totient is φ = 655642.

The previous prime is 655637. The next prime is 655649. The reversal of 655643 is 346556.

It is a balanced prime because it is at equal distance from previous prime (655637) and next prime (655649).

It is a cyclic number.

It is not a de Polignac number, because 655643 - 2⁶ = 655579 is a prime.

It is a Sophie Germain prime.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (655649) 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 as a sum of consecutive naturals, namely, 327821 + 327822.

It is an arithmetic number, because the mean of its divisors is an integer number (327822).

2⁶⁵⁵⁶⁴³ is an apocalyptic number.

655643 is a deficient number, since it is larger than the sum of its proper divisors (1).

655643 is an equidigital number, since it uses as much as digits as its factorization.

655643 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 10800, while the sum is 29.

The square root of 655643 is about 809.7178520942. The cubic root of 655643 is about 86.8738648645.

The spelling of 655643 in words is "six hundred fifty-five thousand, six hundred forty-three".