206170494661 has 2 divisors, whose sum is σ = 206170494662. Its totient is φ = 206170494660.

The previous prime is 206170494653. The next prime is 206170494697. The reversal of 206170494661 is 166494071602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 204172941025 + 1997553636 = 451855^2 + 44694^2 .

It is a cyclic number.

It is not a de Polignac number, because 206170494661 - 2³ = 206170494653 is a prime.

It is a super-2 number, since 2×206170494661² (a number of 23 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (206170494631) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 103085247330 + 103085247331.

It is an arithmetic number, because the mean of its divisors is an integer number (103085247331).

Almost surely, 2^206170494661 is an apocalyptic number.

It is an amenable number.

206170494661 is a deficient number, since it is larger than the sum of its proper divisors (1).

206170494661 is an equidigital number, since it uses as much as digits as its factorization.

206170494661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 435456, while the sum is 46.

The spelling of 206170494661 in words is "two hundred six billion, one hundred seventy million, four hundred ninety-four thousand, six hundred sixty-one".