2666863 has 2 divisors, whose sum is σ = 2666864. Its totient is φ = 2666862.

The previous prime is 2666861. The next prime is 2666887. The reversal of 2666863 is 3686662.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 2666863 - 2¹ = 2666861 is a prime.

It is a super-2 number, since 2×2666863² = 14224316521538, which contains 22 as substring.

Together with 2666861, it forms a pair of twin primes.

It is a d-powerful number, because it can be written as 2¹¹ + 6 + 6⁵ + 6⁷ + 8⁷ + 6⁷ + 3² .

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2666861) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333431 + 1333432.

It is an arithmetic number, because the mean of its divisors is an integer number (1333432).

2^2666863 is an apocalyptic number.

2666863 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666863 is an equidigital number, since it uses as much as digits as its factorization.

2666863 is an evil number, because the sum of its binary digits is even.

The product of its digits is 62208, while the sum is 37.

The square root of 2666863 is about 1633.0532753098. The cubic root of 2666863 is about 138.6756580349.

The spelling of 2666863 in words is "two million, six hundred sixty-six thousand, eight hundred sixty-three".