1820206467173 has 2 divisors, whose sum is σ = 1820206467174. Its totient is φ = 1820206467172.

The previous prime is 1820206467143. The next prime is 1820206467187. The reversal of 1820206467173 is 3717646020281.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1725710477569 + 94495989604 = 1313663^2 + 307402^2 .

It is a cyclic number.

It is not a de Polignac number, because 1820206467173 - 2¹² = 1820206463077 is a prime.

It is a super-2 number, since 2×1820206467173² (a number of 25 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1820206467103) 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, 910103233586 + 910103233587.

It is an arithmetic number, because the mean of its divisors is an integer number (910103233587).

Almost surely, 2^{1820206467173} is an apocalyptic number.

It is an amenable number.

1820206467173 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820206467173 is an equidigital number, since it uses as much as digits as its factorization.

1820206467173 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 677376, while the sum is 47.

The spelling of 1820206467173 in words is "one trillion, eight hundred twenty billion, two hundred six million, four hundred sixty-seven thousand, one hundred seventy-three".