18051663168 has 336 divisors, whose sum is σ = 64748151936. Its totient is φ = 4671406080.

The previous prime is 18051663139. The next prime is 18051663169. The reversal of 18051663168 is 86136615081.

18051663168 is a `hidden beast` number, since 1 + 8 + 0 + 5 + 1 + 6 + 631 + 6 + 8 = 666.

It is a tau number, because it is divible by the number of its divisors (336).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (18051663169) by changing a digit.

It is a polite number, since it can be written in 47 ways as a sum of consecutive naturals, for example, 15655680 + ... + 15656832.

Almost surely, 2^18051663168 is an apocalyptic number.

18051663168 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 18051663168, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (32374075968).

18051663168 is an abundant number, since it is smaller than the sum of its proper divisors (46696488768).

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

18051663168 is a wasteful number, since it uses less digits than its factorization.

18051663168 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1542 (or 1529 counting only the distinct ones).

The product of its (nonzero) digits is 207360, while the sum is 45.

The spelling of 18051663168 in words is "eighteen billion, fifty-one million, six hundred sixty-three thousand, one hundred sixty-eight".