1855183594549 has 2 divisors, whose sum is σ = 1855183594550. Its totient is φ = 1855183594548.

The previous prime is 1855183594519. The next prime is 1855183594619. The reversal of 1855183594549 is 9454953815581.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 1088714862225 + 766468732324 = 1043415^2 + 875482^2 .

It is a cyclic number.

It is not a de Polignac number, because 1855183594549 - 2⁹ = 1855183594037 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (1855183594519) 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, 927591797274 + 927591797275.

It is an arithmetic number, because the mean of its divisors is an integer number (927591797275).

Almost surely, 2^{1855183594549} is an apocalyptic number.

It is an amenable number.

1855183594549 is a deficient number, since it is larger than the sum of its proper divisors (1).

1855183594549 is an equidigital number, since it uses as much as digits as its factorization.

1855183594549 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 155520000, while the sum is 67.

The spelling of 1855183594549 in words is "one trillion, eight hundred fifty-five billion, one hundred eighty-three million, five hundred ninety-four thousand, five hundred forty-nine".