18161488800 has 864 divisors, whose sum is σ = 80461600128. Its totient is φ = 3752386560.

The previous prime is 18161488769. The next prime is 18161488811. The reversal of 18161488800 is 888416181.

18161488800 is a `hidden beast` number, since 1 + 8 + 161 + 488 + 8 + 0 + 0 = 666.

It is a Harshad number since it is a multiple of its sum of digits (45).

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 143 ways as a sum of consecutive naturals, for example, 34725339 + ... + 34725861.

It is an arithmetic number, because the mean of its divisors is an integer number (93126852).

Almost surely, 2^18161488800 is an apocalyptic number.

18161488800 is a gapful number since it is divisible by the number (10) 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 18161488800, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (40230800064).

18161488800 is an abundant number, since it is smaller than the sum of its proper divisors (62300111328).

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

18161488800 is a wasteful number, since it uses less digits than its factorization.

18161488800 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 622 (or 606 counting only the distinct ones).

The product of its (nonzero) digits is 98304, while the sum is 45.

The spelling of 18161488800 in words is "eighteen billion, one hundred sixty-one million, four hundred eighty-eight thousand, eight hundred".