18517711049 has 64 divisors (see below), whose sum is σ = 21393039360. Its totient is φ = 15950753280.

The previous prime is 18517711021. The next prime is 18517711073. The reversal of 18517711049 is 94011771581.

It is not a de Polignac number, because 18517711049 - 2¹⁶ = 18517645513 is a prime.

It is not an unprimeable number, because it can be changed into a prime (18517711019) by changing a digit.

It is a polite number, since it can be written in 63 ways as a sum of consecutive naturals, for example, 83038952 + ... + 83039174.

It is an arithmetic number, because the mean of its divisors is an integer number (334266240).

Almost surely, 2^18517711049 is an apocalyptic number.

18517711049 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18517711049 is a deficient number, since it is larger than the sum of its proper divisors (2875328311).

18517711049 is a wasteful number, since it uses less digits than its factorization.

18517711049 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 430.

The product of its (nonzero) digits is 70560, while the sum is 44.

The spelling of 18517711049 in words is "eighteen billion, five hundred seventeen million, seven hundred eleven thousand, forty-nine".