1642235041549 has 2 divisors, whose sum is σ = 1642235041550. Its totient is φ = 1642235041548.

The previous prime is 1642235041543. The next prime is 1642235041687. The reversal of 1642235041549 is 9451405322461.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1634178722500 + 8056319049 = 1278350^2 + 89757^2 .

It is a cyclic number.

It is not a de Polignac number, because 1642235041549 - 2¹³ = 1642235033357 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 1642235041499 and 1642235041508.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1642235041543) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (23) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 821117520774 + 821117520775.

It is an arithmetic number, because the mean of its divisors is an integer number (821117520775).

Almost surely, 2^{1642235041549} is an apocalyptic number.

It is an amenable number.

1642235041549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1642235041549 is an equidigital number, since it uses as much as digits as its factorization.

1642235041549 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 1036800, while the sum is 46.

The spelling of 1642235041549 in words is "one trillion, six hundred forty-two billion, two hundred thirty-five million, forty-one thousand, five hundred forty-nine".