16680673 has 4 divisors (see below), whose sum is σ = 17131540. Its totient is φ = 16229808.

The previous prime is 16680667. The next prime is 16680679. The reversal of 16680673 is 37608661.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 37608661 = 79 ⋅476059.

It is an interprime number because it is at equal distance from previous prime (16680667) and next prime (16680679).

It can be written as a sum of positive squares in 2 ways, for example, as 9535744 + 7144929 = 3088^2 + 2673^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-16680673 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (37), and also a Moran number because the ratio is a prime number: 450829 = 16680673 / (1 + 6 + 6 + 8 + 0 + 6 + 7 + 3).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16680679) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 225378 + ... + 225451.

It is an arithmetic number, because the mean of its divisors is an integer number (4282885).

Almost surely, 2^16680673 is an apocalyptic number.

It is an amenable number.

16680673 is a deficient number, since it is larger than the sum of its proper divisors (450867).

16680673 is an equidigital number, since it uses as much as digits as its factorization.

16680673 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 450866.

The product of its (nonzero) digits is 36288, while the sum is 37.

The square root of 16680673 is about 4084.1979628808. The cubic root of 16680673 is about 255.5080119985.

The spelling of 16680673 in words is "sixteen million, six hundred eighty thousand, six hundred seventy-three".