11065777661 has 2 divisors, whose sum is σ = 11065777662. Its totient is φ = 11065777660.

The previous prime is 11065777609. The next prime is 11065777663. The reversal of 11065777661 is 16677756011.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 11065777636 + 25 = 105194^2 + 5^2 .

It is a cyclic number.

It is not a de Polignac number, because 11065777661 - 2¹⁴ = 11065761277 is a prime.

Together with 11065777663, it forms a pair of twin primes.

It is a Chen prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11065777663) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5532888830 + 5532888831.

It is an arithmetic number, because the mean of its divisors is an integer number (5532888831).

Almost surely, 2^11065777661 is an apocalyptic number.

It is an amenable number.

11065777661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11065777661 is an equidigital number, since it uses as much as digits as its factorization.

11065777661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 370440, while the sum is 47.

The spelling of 11065777661 in words is "eleven billion, sixty-five million, seven hundred seventy-seven thousand, six hundred sixty-one".