18449545049 has 8 divisors (see below), whose sum is σ = 19892719560. Its totient is φ = 17009796096.

The previous prime is 18449545043. The next prime is 18449545057. The reversal of 18449545049 is 94054594481.

It can be written as a sum of positive squares in 4 ways, for example, as 85229824 + 18364315225 = 9232^2 + 135515^2 .

It is a sphenic number, since it is the product of 3 distinct primes.

It is a cyclic number.

It is not a de Polignac number, because 18449545049 - 2⁸ = 18449544793 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (18449545043) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 845192 + ... + 866745.

It is an arithmetic number, because the mean of its divisors is an integer number (2486589945).

Almost surely, 2^18449545049 is an apocalyptic number.

It is an amenable number.

18449545049 is a deficient number, since it is larger than the sum of its proper divisors (1443174511).

18449545049 is a wasteful number, since it uses less digits than its factorization.

18449545049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1712779.

The product of its (nonzero) digits is 4147200, while the sum is 53.

The spelling of 18449545049 in words is "eighteen billion, four hundred forty-nine million, five hundred forty-five thousand, forty-nine".