16664651 has 8 divisors (see below), whose sum is σ = 17019744. Its totient is φ = 16312320.

The previous prime is 16664629. The next prime is 16664663. The reversal of 16664651 is 15646661.

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

It is a cyclic number.

It is not a de Polignac number, because 16664651 - 2⁶ = 16664587 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16664611) by changing a digit.

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 7 ways as a sum of consecutive naturals, for example, 15146 + ... + 16208.

It is an arithmetic number, because the mean of its divisors is an integer number (2127468).

Almost surely, 2^16664651 is an apocalyptic number.

16664651 is a deficient number, since it is larger than the sum of its proper divisors (355093).

16664651 is a wasteful number, since it uses less digits than its factorization.

16664651 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1381.

The product of its digits is 25920, while the sum is 35.

The square root of 16664651 is about 4082.2360294329. The cubic root of 16664651 is about 255.4261795535.

The spelling of 16664651 in words is "sixteen million, six hundred sixty-four thousand, six hundred fifty-one".