2666779 has 2 divisors, whose sum is σ = 2666780. Its totient is φ = 2666778.

The previous prime is 2666749. The next prime is 2666791. The reversal of 2666779 is 9776662.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 2666779 - 2⁵ = 2666747 is a prime.

It is a super-2 number, since 2×2666779² = 14223420469682, which contains 22 as substring.

It is a plaindrome in base 10.

It is not a weakly prime, because it can be changed into another prime (2666749) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1333389 + 1333390.

It is an arithmetic number, because the mean of its divisors is an integer number (1333390).

2^2666779 is an apocalyptic number.

2666779 is a deficient number, since it is larger than the sum of its proper divisors (1).

2666779 is an equidigital number, since it uses as much as digits as its factorization.

2666779 is an evil number, because the sum of its binary digits is even.

The product of its digits is 190512, while the sum is 43.

The square root of 2666779 is about 1633.0275564117. The cubic root of 2666779 is about 138.6742020324.

The spelling of 2666779 in words is "two million, six hundred sixty-six thousand, seven hundred seventy-nine".