17997793056 has 144 divisors (see below), whose sum is σ = 53215999200. Its totient is φ = 5983538688.

The previous prime is 17997793027. The next prime is 17997793069. The reversal of 17997793056 is 65039779971.

17997793056 is a `hidden beast` number, since 179 + 97 + 79 + 305 + 6 = 666.

It is a tau number, because it is divible by the number of its divisors (144).

It is a Smith number, since the sum of its digits (63) coincides with the sum of the digits of its prime factors.

It is a junction number, because it is equal to n+sod(n) for n = 17997792984 and 17997793002.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 3177555 + ... + 3183213.

It is an arithmetic number, because the mean of its divisors is an integer number (369555550).

Almost surely, 2^17997793056 is an apocalyptic number.

17997793056 is a gapful number since it is divisible by the number (16) 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 17997793056, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (26607999600).

17997793056 is an abundant number, since it is smaller than the sum of its proper divisors (35218206144).

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

17997793056 is an equidigital number, since it uses as much as digits as its factorization.

17997793056 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 6093 (or 6073 counting only the distinct ones).

The product of its (nonzero) digits is 22504230, while the sum is 63.

The spelling of 17997793056 in words is "seventeen billion, nine hundred ninety-seven million, seven hundred ninety-three thousand, fifty-six".