16706681 has 4 divisors (see below), whose sum is σ = 17586000. Its totient is φ = 15827364.

The previous prime is 16706653. The next prime is 16706689. The reversal of 16706681 is 18660761.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4, and also an emirpimes, since its reverse is a distinct semiprime: 18660761 = 7 ⋅2665823.

It is a cyclic number.

It is not a de Polignac number, because 16706681 - 2¹⁰ = 16705657 is a prime.

It is a super-2 number, since 2×16706681² = 558226380071522, which contains 22 as substring.

It is a Duffinian number.

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (16706689) 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, 439631 + ... + 439668.

It is an arithmetic number, because the mean of its divisors is an integer number (4396500).

Almost surely, 2^16706681 is an apocalyptic number.

It is an amenable number.

16706681 is a deficient number, since it is larger than the sum of its proper divisors (879319).

16706681 is an equidigital number, since it uses as much as digits as its factorization.

16706681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 879318.

The product of its (nonzero) digits is 12096, while the sum is 35.

The square root of 16706681 is about 4087.3807016230. The cubic root of 16706681 is about 255.6407364929.

The spelling of 16706681 in words is "sixteen million, seven hundred six thousand, six hundred eighty-one".