16665746017 has 4 divisors (see below), whose sum is σ = 17646084036. Its totient is φ = 15685408000.

The previous prime is 16665746003. The next prime is 16665746023. The reversal of 16665746017 is 71064756661.

16665746017 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 9990202401 + 6675543616 = 99951^2 + 81704^2 .

It is a cyclic number.

It is not a de Polignac number, because 16665746017 - 2²⁷ = 16531528289 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16665746047) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 490168984 + ... + 490169017.

It is an arithmetic number, because the mean of its divisors is an integer number (4411521009).

Almost surely, 2^16665746017 is an apocalyptic number.

16665746017 is a gapful number since it is divisible by the number (17) formed by its first and last digit.

It is an amenable number.

16665746017 is a deficient number, since it is larger than the sum of its proper divisors (980338019).

16665746017 is an equidigital number, since it uses as much as digits as its factorization.

16665746017 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 980338018.

The product of its (nonzero) digits is 1270080, while the sum is 49.

The spelling of 16665746017 in words is "sixteen billion, six hundred sixty-five million, seven hundred forty-six thousand, seventeen".