1820445442597 has 2 divisors, whose sum is σ = 1820445442598. Its totient is φ = 1820445442596.

The previous prime is 1820445442553. The next prime is 1820445442769. The reversal of 1820445442597 is 7952445440281.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1220949861156 + 599495581441 = 1104966^2 + 774271^2 .

It is a cyclic number.

It is not a de Polignac number, because 1820445442597 - 2³¹ = 1818297958949 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1820445442897) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 910222721298 + 910222721299.

It is an arithmetic number, because the mean of its divisors is an integer number (910222721299).

Almost surely, 2^{1820445442597} is an apocalyptic number.

It is an amenable number.

1820445442597 is a deficient number, since it is larger than the sum of its proper divisors (1).

1820445442597 is an equidigital number, since it uses as much as digits as its factorization.

1820445442597 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 12902400, while the sum is 55.

The spelling of 1820445442597 in words is "one trillion, eight hundred twenty billion, four hundred forty-five million, four hundred forty-two thousand, five hundred ninety-seven".