16626665 has 16 divisors (see below), whose sum is σ = 21845376. Its totient is φ = 12048000.

The previous prime is 16626641. The next prime is 16626671. The reversal of 16626665 is 56662661.

It is not a de Polignac number, because 16626665 - 2¹² = 16622569 is a prime.

It is a Duffinian number.

It is an unprimeable number.

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 15 ways as a sum of consecutive naturals, for example, 27365 + ... + 27965.

It is an arithmetic number, because the mean of its divisors is an integer number (1365336).

Almost surely, 2^16626665 is an apocalyptic number.

It is an amenable number.

16626665 is a deficient number, since it is larger than the sum of its proper divisors (5218711).

16626665 is a wasteful number, since it uses less digits than its factorization.

16626665 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1120.

The product of its digits is 77760, while the sum is 38.

The square root of 16626665 is about 4077.5807778633. The cubic root of 16626665 is about 255.2319560567.

The spelling of 16626665 in words is "sixteen million, six hundred twenty-six thousand, six hundred sixty-five".