1655663 has 2 divisors, whose sum is σ = 1655664. Its totient is φ = 1655662.

The previous prime is 1655659. The next prime is 1655671. The reversal of 1655663 is 3665561.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1655663 - 2² = 1655659 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1655623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 827831 + 827832.

It is an arithmetic number, because the mean of its divisors is an integer number (827832).

2^1655663 is an apocalyptic number.

1655663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1655663 is an equidigital number, since it uses as much as digits as its factorization.

1655663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 16200, while the sum is 32.

The square root of 1655663 is about 1286.7256894925. The cubic root of 1655663 is about 118.3016080175.

The spelling of 1655663 in words is "one million, six hundred fifty-five thousand, six hundred sixty-three".