18518403249 has 16 divisors (see below), whose sum is σ = 27543983040. Its totient is φ = 12296412000.

The previous prime is 18518403217. The next prime is 18518403311. The reversal of 18518403249 is 94230481581.

It is not a de Polignac number, because 18518403249 - 2⁵ = 18518403217 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18518403649) by changing a digit.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 1359492 + ... + 1373045.

It is an arithmetic number, because the mean of its divisors is an integer number (1721498940).

Almost surely, 2^18518403249 is an apocalyptic number.

It is an amenable number.

18518403249 is a deficient number, since it is larger than the sum of its proper divisors (9025579791).

18518403249 is a wasteful number, since it uses less digits than its factorization.

18518403249 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2732797 (or 2732791 counting only the distinct ones).

The product of its (nonzero) digits is 276480, while the sum is 45.

The spelling of 18518403249 in words is "eighteen billion, five hundred eighteen million, four hundred three thousand, two hundred forty-nine".