1667663 has 2 divisors, whose sum is σ = 1667664. Its totient is φ = 1667662.

The previous prime is 1667651. The next prime is 1667689. The reversal of 1667663 is 3667661.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 1667663 - 2⁴ = 1667647 is a prime.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1667623) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 833831 + 833832.

It is an arithmetic number, because the mean of its divisors is an integer number (833832).

2^1667663 is an apocalyptic number.

1667663 is a deficient number, since it is larger than the sum of its proper divisors (1).

1667663 is an equidigital number, since it uses as much as digits as its factorization.

1667663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 27216, while the sum is 35.

The square root of 1667663 is about 1291.3802693243. The cubic root of 1667663 is about 118.5867311192.

The spelling of 1667663 in words is "one million, six hundred sixty-seven thousand, six hundred sixty-three".