16646642 has 8 divisors (see below), whose sum is σ = 25110000. Its totient is φ = 8276644.

The previous prime is 16646639. The next prime is 16646657. The reversal of 16646642 is 24664661.

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

It is a super-2 number, since 2×16646642² = 554221379752328, which contains 22 as substring.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 22892 + ... + 23607.

It is an arithmetic number, because the mean of its divisors is an integer number (3138750).

Almost surely, 2^16646642 is an apocalyptic number.

16646642 is a deficient number, since it is larger than the sum of its proper divisors (8463358).

16646642 is a wasteful number, since it uses less digits than its factorization.

16646642 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 46680.

The product of its digits is 41472, while the sum is 35.

The square root of 16646642 is about 4080.0296567550. The cubic root of 16646642 is about 255.3341358601.

The spelling of 16646642 in words is "sixteen million, six hundred forty-six thousand, six hundred forty-two".