206566665029 has 2 divisors, whose sum is σ = 206566665030. Its totient is φ = 206566665028.

The previous prime is 206566665007. The next prime is 206566665037. The reversal of 206566665029 is 920566665602.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 205666785025 + 899880004 = 453505^2 + 29998^2 .

It is a cyclic number.

It is not a de Polignac number, because 206566665029 - 2²⁸ = 206298229573 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206566665089) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103283332514 + 103283332515.

It is an arithmetic number, because the mean of its divisors is an integer number (103283332515).

Almost surely, 2^206566665029 is an apocalyptic number.

It is an amenable number.

206566665029 is a deficient number, since it is larger than the sum of its proper divisors (1).

206566665029 is an equidigital number, since it uses as much as digits as its factorization.

206566665029 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6998400, while the sum is 53.

The spelling of 206566665029 in words is "two hundred six billion, five hundred sixty-six million, six hundred sixty-five thousand, twenty-nine".