2195565281549 has 2 divisors, whose sum is σ = 2195565281550. Its totient is φ = 2195565281548.

The previous prime is 2195565281519. The next prime is 2195565281557. The reversal of 2195565281549 is 9451825655912.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 1971356402500 + 224208879049 = 1404050^2 + 473507^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-2195565281549 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 2195565281491 and 2195565281500.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (2195565281519) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 1097782640774 + 1097782640775.

It is an arithmetic number, because the mean of its divisors is an integer number (1097782640775).

Almost surely, 2^{2195565281549} is an apocalyptic number.

It is an amenable number.

2195565281549 is a deficient number, since it is larger than the sum of its proper divisors (1).

2195565281549 is an equidigital number, since it uses as much as digits as its factorization.

2195565281549 is an evil number, because the sum of its binary digits is even.

The product of its digits is 38880000, while the sum is 62.

The spelling of 2195565281549 in words is "two trillion, one hundred ninety-five billion, five hundred sixty-five million, two hundred eighty-one thousand, five hundred forty-nine".