101665606661 has 2 divisors, whose sum is σ = 101665606662. Its totient is φ = 101665606660.

The previous prime is 101665606631. The next prime is 101665606667. The reversal of 101665606661 is 166606566101.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 100683097636 + 982509025 = 317306^2 + 31345^2 .

It is a cyclic number.

It is not a de Polignac number, because 101665606661 - 2¹⁰ = 101665605637 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (101665606667) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 50832803330 + 50832803331.

It is an arithmetic number, because the mean of its divisors is an integer number (50832803331).

Almost surely, 2^101665606661 is an apocalyptic number.

It is an amenable number.

101665606661 is a deficient number, since it is larger than the sum of its proper divisors (1).

101665606661 is an equidigital number, since it uses as much as digits as its factorization.

101665606661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 233280, while the sum is 44.

The spelling of 101665606661 in words is "one hundred one billion, six hundred sixty-five million, six hundred six thousand, six hundred sixty-one".