11145666661 has 2 divisors, whose sum is σ = 11145666662. Its totient is φ = 11145666660.

The previous prime is 11145666643. The next prime is 11145666683. The reversal of 11145666661 is 16666654111.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5713092225 + 5432574436 = 75585^2 + 73706^2 .

It is a cyclic number.

It is not a de Polignac number, because 11145666661 - 2⁷ = 11145666533 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (11145661661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 5572833330 + 5572833331.

It is an arithmetic number, because the mean of its divisors is an integer number (5572833331).

Almost surely, 2^11145666661 is an apocalyptic number.

It is an amenable number.

11145666661 is a deficient number, since it is larger than the sum of its proper divisors (1).

11145666661 is an equidigital number, since it uses as much as digits as its factorization.

11145666661 is an evil number, because the sum of its binary digits is even.

The product of its digits is 155520, while the sum is 43.

The spelling of 11145666661 in words is "eleven billion, one hundred forty-five million, six hundred sixty-six thousand, six hundred sixty-one".