16666073 has 4 divisors (see below), whose sum is σ = 16692480. Its totient is φ = 16639668.

The previous prime is 16666061. The next prime is 16666081. The reversal of 16666073 is 37066661.

It is a happy number.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is a cyclic number.

It is not a de Polignac number, because 16666073 - 2⁴ = 16666057 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (16666033) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 12233 + ... + 13526.

It is an arithmetic number, because the mean of its divisors is an integer number (4173120).

Almost surely, 2^16666073 is an apocalyptic number.

It is an amenable number.

16666073 is a deficient number, since it is larger than the sum of its proper divisors (26407).

16666073 is an equidigital number, since it uses as much as digits as its factorization.

16666073 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 26406.

The product of its (nonzero) digits is 27216, while the sum is 35.

The square root of 16666073 is about 4082.4101949706. The cubic root of 16666073 is about 255.4334445461.

The spelling of 16666073 in words is "sixteen million, six hundred sixty-six thousand, seventy-three".