2011266661 has 2 divisors, whose sum is σ = 2011266662. Its totient is φ = 2011266660.

The previous prime is 2011266643. The next prime is 2011266709. The reversal of 2011266661 is 1666621102.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1458781636 + 552485025 = 38194^2 + 23505^2 .

It is a cyclic number.

It is not a de Polignac number, because 2011266661 - 2¹⁷ = 2011135589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2011266601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1005633330 + 1005633331.

It is an arithmetic number, because the mean of its divisors is an integer number (1005633331).

Almost surely, 2^2011266661 is an apocalyptic number.

It is an amenable number.

2011266661 is a deficient number, since it is larger than the sum of its proper divisors (1).

2011266661 is an equidigital number, since it uses as much as digits as its factorization.

2011266661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 5184, while the sum is 31.

The square root of 2011266661 is about 44847.1477465401. The cubic root of 2011266661 is about 1262.2824717663.

Adding to 2011266661 its reverse (1666621102), we get a palindrome (3677887763).

The spelling of 2011266661 in words is "two billion, eleven million, two hundred sixty-six thousand, six hundred sixty-one".