1668617 has 2 divisors, whose sum is σ = 1668618. Its totient is φ = 1668616.

The previous prime is 1668593. The next prime is 1668619. The reversal of 1668617 is 7168661.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1666681 + 1936 = 1291^2 + 44^2 .

It is an emirp because it is prime and its reverse (7168661) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 1668617 - 2⁶ = 1668553 is a prime.

It is a super-3 number, since 3×1668617³ = 13937704301479923339, which contains 333 as substring.

Together with 1668619, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (1668619) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 834308 + 834309.

It is an arithmetic number, because the mean of its divisors is an integer number (834309).

2^1668617 is an apocalyptic number.

It is an amenable number.

1668617 is a deficient number, since it is larger than the sum of its proper divisors (1).

1668617 is an equidigital number, since it uses as much as digits as its factorization.

1668617 is an evil number, because the sum of its binary digits is even.

The product of its digits is 12096, while the sum is 35.

The square root of 1668617 is about 1291.7495887361. The cubic root of 1668617 is about 118.6093396389.

The spelling of 1668617 in words is "one million, six hundred sixty-eight thousand, six hundred seventeen".