16671637 has 4 divisors (see below), whose sum is σ = 16679916. Its totient is φ = 16663360.

The previous prime is 16671631. The next prime is 16671643. The reversal of 16671637 is 73617661.

It is a semiprime because it is the product of two primes, and also a brilliant number, because the two primes have the same length, and also an emirpimes, since its reverse is a distinct semiprime: 73617661 = 13 ⋅5662897.

It is an interprime number because it is at equal distance from previous prime (16671631) and next prime (16671643).

It can be written as a sum of positive squares in 2 ways, for example, as 2337841 + 14333796 = 1529^2 + 3786^2 .

It is a cyclic number.

It is not a de Polignac number, because 16671637 - 2¹⁹ = 16147349 is a prime.

It is a Duffinian number.

It is a junction number, because it is equal to n+sod(n) for n = 16671596 and 16671605.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16671631) 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, 1053 + ... + 5869.

It is an arithmetic number, because the mean of its divisors is an integer number (4169979).

Almost surely, 2^16671637 is an apocalyptic number.

It is an amenable number.

16671637 is a deficient number, since it is larger than the sum of its proper divisors (8279).

16671637 is an equidigital number, since it uses as much as digits as its factorization.

16671637 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8278.

The product of its digits is 31752, while the sum is 37.

The square root of 16671637 is about 4083.0915982868. The cubic root of 16671637 is about 255.4618670296.

It can be divided in two parts, 166716 and 37, that added together give a triangular number (166753 = T₅₇₇).

The spelling of 16671637 in words is "sixteen million, six hundred seventy-one thousand, six hundred thirty-seven".