206804155600897 has 2 divisors, whose sum is σ = 206804155600898. Its totient is φ = 206804155600896.

The previous prime is 206804155600873. The next prime is 206804155600957. The reversal of 206804155600897 is 798006551408602.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 121397558019136 + 85406597581761 = 11018056^2 + 9241569^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-206804155600897 is a prime.

It is not a weakly prime, because it can be changed into another prime (206804155100897) 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, 103402077800448 + 103402077800449.

It is an arithmetic number, because the mean of its divisors is an integer number (103402077800449).

Almost surely, 2^{206804155600897} is an apocalyptic number.

It is an amenable number.

206804155600897 is a deficient number, since it is larger than the sum of its proper divisors (1).

206804155600897 is an equidigital number, since it uses as much as digits as its factorization.

206804155600897 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 29030400, while the sum is 61.

The spelling of 206804155600897 in words is "two hundred six trillion, eight hundred four billion, one hundred fifty-five million, six hundred thousand, eight hundred ninety-seven".