18461558808 has 192 divisors, whose sum is σ = 62542771200. Its totient is φ = 4779440640.

The previous prime is 18461558807. The next prime is 18461558809. The reversal of 18461558808 is 80885516481.

18461558808 is a `hidden beast` number, since 1 + 8 + 4 + 6 + 1 + 558 + 80 + 8 = 666.

It is an interprime number because it is at equal distance from previous prime (18461558807) and next prime (18461558809).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18461558807) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 1729953 + ... + 1740591.

It is an arithmetic number, because the mean of its divisors is an integer number (325743600).

Almost surely, 2^18461558808 is an apocalyptic number.

18461558808 is a gapful number since it is divisible by the number (18) formed by its first and last digit.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 18461558808, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (31271385600).

18461558808 is an abundant number, since it is smaller than the sum of its proper divisors (44081212392).

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

18461558808 is a wasteful number, since it uses less digits than its factorization.

18461558808 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 10982 (or 10975 counting only the distinct ones).

The product of its (nonzero) digits is 2457600, while the sum is 54.

The spelling of 18461558808 in words is "eighteen billion, four hundred sixty-one million, five hundred fifty-eight thousand, eight hundred eight".