66665443 has 8 divisors (see below), whose sum is σ = 72271136. Its totient is φ = 61128000.

The previous prime is 66665441. The next prime is 66665447. The reversal of 66665443 is 34456666.

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 66665443 - 2¹ = 66665441 is a prime.

It is a Duffinian number.

It is a nialpdrome in base 10.

It is a junction number, because it is equal to n+sod(n) for n = 66665396 and 66665405.

It is not an unprimeable number, because it can be changed into a prime (66665441) 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, 15018 + ... + 18943.

It is an arithmetic number, because the mean of its divisors is an integer number (9033892).

Almost surely, 2^66665443 is an apocalyptic number.

66665443 is a deficient number, since it is larger than the sum of its proper divisors (5605693).

66665443 is a wasteful number, since it uses less digits than its factorization.

66665443 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 34125.

The product of its digits is 311040, while the sum is 40.

The square root of 66665443 is about 8164.8908749597. The cubic root of 66665443 is about 405.4776521604.

The spelling of 66665443 in words is "sixty-six million, six hundred sixty-five thousand, four hundred forty-three".