18146556049 has 2 divisors, whose sum is σ = 18146556050. Its totient is φ = 18146556048.

The previous prime is 18146556017. The next prime is 18146556061. The reversal of 18146556049 is 94065564181.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 13852113025 + 4294443024 = 117695^2 + 65532^2 .

It is an emirp because it is prime and its reverse (94065564181) is a distict prime.

It is a cyclic number.

It is not a de Polignac number, because 18146556049 - 2⁵ = 18146556017 is a prime.

It is a junction number, because it is equal to n+sod(n) for n = 18146555993 and 18146556011.

It is not a weakly prime, because it can be changed into another prime (18146550049) 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, 9073278024 + 9073278025.

It is an arithmetic number, because the mean of its divisors is an integer number (9073278025).

Almost surely, 2^18146556049 is an apocalyptic number.

It is an amenable number.

18146556049 is a deficient number, since it is larger than the sum of its proper divisors (1).

18146556049 is an equidigital number, since it uses as much as digits as its factorization.

18146556049 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 49.

The spelling of 18146556049 in words is "eighteen billion, one hundred forty-six million, five hundred fifty-six thousand, forty-nine".