16667642 has 4 divisors (see below), whose sum is σ = 25001466. Its totient is φ = 8333820.

The previous prime is 16667641. The next prime is 16667647. The reversal of 16667642 is 24676661.

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

It can be written as a sum of positive squares in only one way, i.e., 15689521 + 978121 = 3961^2 + 989^2 .

It is a junction number, because it is equal to n+sod(n) for n = 16667596 and 16667605.

It is not an unprimeable number, because it can be changed into a prime (16667641) 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 as a sum of consecutive naturals, namely, 4166909 + ... + 4166912.

Almost surely, 2^16667642 is an apocalyptic number.

16667642 is a deficient number, since it is larger than the sum of its proper divisors (8333824).

16667642 is an equidigital number, since it uses as much as digits as its factorization.

16667642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 8333823.

The product of its digits is 72576, while the sum is 38.

The square root of 16667642 is about 4082.6023563409. The cubic root of 16667642 is about 255.4414600815.

The spelling of 16667642 in words is "sixteen million, six hundred sixty-seven thousand, six hundred forty-two".