16665407 has 8 divisors (see below), whose sum is σ = 18210000. Its totient is φ = 15125760.

The previous prime is 16665403. The next prime is 16665421. The reversal of 16665407 is 70456661.

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 16665407 - 2² = 16665403 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (16665403) 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 in 7 ways as a sum of consecutive naturals, for example, 12719 + ... + 13967.

It is an arithmetic number, because the mean of its divisors is an integer number (2276250).

Almost surely, 2^16665407 is an apocalyptic number.

16665407 is a deficient number, since it is larger than the sum of its proper divisors (1544593).

16665407 is a wasteful number, since it uses less digits than its factorization.

16665407 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2473.

The product of its (nonzero) digits is 30240, while the sum is 35.

The square root of 16665407 is about 4082.3286246945. The cubic root of 16665407 is about 255.4300420061.

The spelling of 16665407 in words is "sixteen million, six hundred sixty-five thousand, four hundred seven".