2766661 has 2 divisors, whose sum is σ = 2766662. Its totient is φ = 2766660.

The previous prime is 2766649. The next prime is 2766667. The reversal of 2766661 is 1666672.

2766661 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2117025 + 649636 = 1455^2 + 806^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2766661 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2766667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1383330 + 1383331.

It is an arithmetic number, because the mean of its divisors is an integer number (1383331).

2^2766661 is an apocalyptic number.

It is an amenable number.

2766661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2766661 is an equidigital number, since it uses as much as digits as its factorization.

2766661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 18144, while the sum is 34.

The square root of 2766661 is about 1663.3282899055. The cubic root of 2766661 is about 140.3843350948.

The spelling of 2766661 in words is "two million, seven hundred sixty-six thousand, six hundred sixty-one".