2061557545717 has 2 divisors, whose sum is σ = 2061557545718. Its totient is φ = 2061557545716.

The previous prime is 2061557545667. The next prime is 2061557545753. The reversal of 2061557545717 is 7175457551602.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 2056789090801 + 4768454916 = 1434151^2 + 69054^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2061557545717 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2061557546717) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (31) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1030778772858 + 1030778772859.

It is an arithmetic number, because the mean of its divisors is an integer number (1030778772859).

Almost surely, 2^{2061557545717} is an apocalyptic number.

It is an amenable number.

2061557545717 is a deficient number, since it is larger than the sum of its proper divisors (1).

2061557545717 is an equidigital number, since it uses as much as digits as its factorization.

2061557545717 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 10290000, while the sum is 55.

The spelling of 2061557545717 in words is "two trillion, sixty-one billion, five hundred fifty-seven million, five hundred forty-five thousand, seven hundred seventeen".