2666663 has 2 divisors, whose sum is σ = 2666664. Its totient is φ = 2666662.

The previous prime is 2666659. The next prime is 2666683. The reversal of 2666663 is 3666662.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2666663 - 2² = 2666659 is a prime.

It is a super-2 number, since 2×2666663² = 14222183111138, which contains 22 as substring.

It is a Sophie Germain prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2666633) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333331 + 1333332.

It is an arithmetic number, because the mean of its divisors is an integer number (1333332).

2^2666663 is an apocalyptic number.

2666663 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666663 is an equidigital number, since it uses as much as digits as its factorization.

2666663 is an evil number, because the sum of its binary digits is even.

The product of its digits is 46656, while the sum is 35.

The square root of 2666663 is about 1632.9920391723. The cubic root of 2666663 is about 138.6721913120.

Subtracting 2666663 from its reverse (3666662), we obtain a palindrome (999999).

The spelling of 2666663 in words is "two million, six hundred sixty-six thousand, six hundred sixty-three".