18484437109 has 4 divisors (see below), whose sum is σ = 19457302240. Its totient is φ = 17511571980.

The previous prime is 18484437077. The next prime is 18484437131. The reversal of 18484437109 is 90173448481.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 90173448481 = 4931 ⋅18287051.

It is a cyclic number.

It is not a de Polignac number, because 18484437109 - 2⁵ = 18484437077 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18484437409) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 486432537 + ... + 486432574.

It is an arithmetic number, because the mean of its divisors is an integer number (4864325560).

Almost surely, 2^18484437109 is an apocalyptic number.

18484437109 is a gapful number since it is divisible by the number (19) formed by its first and last digit.

It is an amenable number.

18484437109 is a deficient number, since it is larger than the sum of its proper divisors (972865131).

18484437109 is an equidigital number, since it uses as much as digits as its factorization.

18484437109 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 972865130.

The product of its (nonzero) digits is 774144, while the sum is 49.

The spelling of 18484437109 in words is "eighteen billion, four hundred eighty-four million, four hundred thirty-seven thousand, one hundred nine".