16722681 has 8 divisors (see below), whose sum is σ = 22323264. Its totient is φ = 11135280.

The previous prime is 16722661. The next prime is 16722683. The reversal of 16722681 is 18622761.

It is a sphenic number, since it is the product of 3 distinct primes.

It is not a de Polignac number, because 16722681 - 2⁵ = 16722649 is a prime.

It is a super-2 number, since 2×16722681² = 559296119655522, which contains 22 as substring.

It is not an unprimeable number, because it can be changed into a prime (16722683) 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 7 ways as a sum of consecutive naturals, for example, 196 + ... + 5786.

It is an arithmetic number, because the mean of its divisors is an integer number (2790408).

Almost surely, 2^16722681 is an apocalyptic number.

It is an amenable number.

16722681 is a deficient number, since it is larger than the sum of its proper divisors (5600583).

16722681 is an equidigital number, since it uses as much as digits as its factorization.

16722681 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6591.

The product of its digits is 8064, while the sum is 33.

The square root of 16722681 is about 4089.3374769026. The cubic root of 16722681 is about 255.7223195581.

The spelling of 16722681 in words is "sixteen million, seven hundred twenty-two thousand, six hundred eighty-one".