17666663056 has 135 divisors (see below), whose sum is σ = 41089590057. Its totient is φ = 7336963200.

The previous prime is 17666663051. The next prime is 17666663057. The reversal of 17666663056 is 65036666671.

The square root of 17666663056 is 132916.

It is a perfect power (a square), and thus also a powerful number.

It can be written as a sum of positive squares in only one way, i.e., 16973920656 + 692742400 = 130284^2 + 26320^2 .

It is a super-2 number, since 2×17666663056² (a number of 21 digits) contains 22 as substring.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 17666662994 and 17666663012.

It is not an unprimeable number, because it can be changed into a prime (17666663051) by changing a digit.

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 26 ways as a sum of consecutive naturals, for example, 174917406 + ... + 174917506.

Almost surely, 2^17666663056 is an apocalyptic number.

17666663056 is a gapful number since it is divisible by the number (16) formed by its first and last digit.

17666663056 is the 132916-th square number.

It is an amenable number.

It is a practical number, because each smaller number is the sum of distinct divisors of 17666663056

17666663056 is an abundant number, since it is smaller than the sum of its proper divisors (23422927001).

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

17666663056 is an equidigital number, since it uses as much as digits as its factorization.

17666663056 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 318 (or 157 counting only the distinct ones).

The product of its (nonzero) digits is 4898880, while the sum is 52.

The spelling of 17666663056 in words is "seventeen billion, six hundred sixty-six million, six hundred sixty-three thousand, fifty-six".