18409008618 has 256 divisors, whose sum is σ = 55508705280. Its totient is φ = 4367001600.

The previous prime is 18409008613. The next prime is 18409008643. The reversal of 18409008618 is 81680090481.

It is not an unprimeable number, because it can be changed into a prime (18409008613) by changing a digit.

It is a polite number, since it can be written in 127 ways as a sum of consecutive naturals, for example, 5241483 + ... + 5244993.

It is an arithmetic number, because the mean of its divisors is an integer number (216830880).

Almost surely, 2^18409008618 is an apocalyptic number.

18409008618 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is a practical number, because each smaller number is the sum of distinct divisors of 18409008618, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (27754352640).

18409008618 is an abundant number, since it is smaller than the sum of its proper divisors (37099696662).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

18409008618 is a wasteful number, since it uses less digits than its factorization.

18409008618 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3650 (or 3644 counting only the distinct ones).

The product of its (nonzero) digits is 110592, while the sum is 45.

The spelling of 18409008618 in words is "eighteen billion, four hundred nine million, eight thousand, six hundred eighteen".