20066358661 has 2 divisors, whose sum is σ = 20066358662. Its totient is φ = 20066358660.

The previous prime is 20066358601. The next prime is 20066358677. The reversal of 20066358661 is 16685366002.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 19703456161 + 362902500 = 140369^2 + 19050^2 .

It is a cyclic number.

It is not a de Polignac number, because 20066358661 - 2¹⁷ = 20066227589 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (20066358601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 10033179330 + 10033179331.

It is an arithmetic number, because the mean of its divisors is an integer number (10033179331).

Almost surely, 2^20066358661 is an apocalyptic number.

It is an amenable number.

20066358661 is a deficient number, since it is larger than the sum of its proper divisors (1).

20066358661 is an equidigital number, since it uses as much as digits as its factorization.

20066358661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 311040, while the sum is 43.

The spelling of 20066358661 in words is "twenty billion, sixty-six million, three hundred fifty-eight thousand, six hundred sixty-one".