206660517001571 has 2 divisors, whose sum is σ = 206660517001572. Its totient is φ = 206660517001570.

The previous prime is 206660517001553. The next prime is 206660517001667. The reversal of 206660517001571 is 175100715066602.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 206660517001571 - 2³⁴ = 206643337132387 is a prime.

It is not a weakly prime, because it can be changed into another prime (206660517061571) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (29) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103330258500785 + 103330258500786.

It is an arithmetic number, because the mean of its divisors is an integer number (103330258500786).

Almost surely, 2^{206660517001571} is an apocalyptic number.

206660517001571 is a deficient number, since it is larger than the sum of its proper divisors (1).

206660517001571 is an equidigital number, since it uses as much as digits as its factorization.

206660517001571 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 529200, while the sum is 47.

The spelling of 206660517001571 in words is "two hundred six trillion, six hundred sixty billion, five hundred seventeen million, one thousand, five hundred seventy-one".