16664819 has 8 divisors (see below), whose sum is σ = 17146080. Its totient is φ = 16187200.

The previous prime is 16664807. The next prime is 16664827. The reversal of 16664819 is 91846661.

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 16664819 - 2⁴ = 16664803 is a prime.

It is a super-2 number, since 2×16664819² = 555432384605522, which contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (41).

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16664119) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 10274 + ... + 11784.

It is an arithmetic number, because the mean of its divisors is an integer number (2143260).

Almost surely, 2^16664819 is an apocalyptic number.

16664819 is a deficient number, since it is larger than the sum of its proper divisors (481261).

16664819 is a wasteful number, since it uses less digits than its factorization.

16664819 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1821.

The product of its digits is 62208, while the sum is 41.

The square root of 16664819 is about 4082.2566063392. The cubic root of 16664819 is about 255.4270378864.

The spelling of 16664819 in words is "sixteen million, six hundred sixty-four thousand, eight hundred nineteen".