1806646242197 has 2 divisors, whose sum is σ = 1806646242198. Its totient is φ = 1806646242196.

The previous prime is 1806646242161. The next prime is 1806646242263. The reversal of 1806646242197 is 7912426466081.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1726086205636 + 80560036561 = 1313806^2 + 283831^2 .

It is a cyclic number.

It is not a de Polignac number, because 1806646242197 - 2⁸ = 1806646241941 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1806646242997) 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, 903323121098 + 903323121099.

It is an arithmetic number, because the mean of its divisors is an integer number (903323121099).

Almost surely, 2^{1806646242197} is an apocalyptic number.

It is an amenable number.

1806646242197 is a deficient number, since it is larger than the sum of its proper divisors (1).

1806646242197 is an equidigital number, since it uses as much as digits as its factorization.

1806646242197 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 6967296, while the sum is 56.

The spelling of 1806646242197 in words is "one trillion, eight hundred six billion, six hundred forty-six million, two hundred forty-two thousand, one hundred ninety-seven".