1668503 has 2 divisors, whose sum is σ = 1668504. Its totient is φ = 1668502.

The previous prime is 1668481. The next prime is 1668509. The reversal of 1668503 is 3058661.

It is a strong prime.

It is an emirp because it is prime and its reverse (3058661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1668503 - 2¹² = 1664407 is a prime.

It is a super-2 number, since 2×1668503² = 5567804522018, which contains 22 as substring.

It is a Sophie Germain 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 (1668509) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834251 + 834252.

It is an arithmetic number, because the mean of its divisors is an integer number (834252).

2^1668503 is an apocalyptic number.

1668503 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668503 is an equidigital number, since it uses as much as digits as its factorization.

1668503 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 4320, while the sum is 29.

The square root of 1668503 is about 1291.7054617830. The cubic root of 1668503 is about 118.6066384453.

The spelling of 1668503 in words is "one million, six hundred sixty-eight thousand, five hundred three".