66804423 has 8 divisors (see below), whose sum is σ = 101797248. Its totient is φ = 38173944.

The previous prime is 66804391. The next prime is 66804431. The reversal of 66804423 is 32440866.

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

It is not a de Polignac number, because 66804423 - 2⁵ = 66804391 is a prime.

It is a Smith number, since the sum of its digits (33) coincides with the sum of the digits of its prime factors. Since it is squarefree, it is also a hoax number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (66804923) 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, 1590561 + ... + 1590602.

It is an arithmetic number, because the mean of its divisors is an integer number (12724656).

Almost surely, 2^66804423 is an apocalyptic number.

66804423 is a deficient number, since it is larger than the sum of its proper divisors (34992825).

66804423 is a wasteful number, since it uses less digits than its factorization.

66804423 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 3181173.

The product of its (nonzero) digits is 27648, while the sum is 33.

The square root of 66804423 is about 8173.3972740838. The cubic root of 66804423 is about 405.7592281726.

The spelling of 66804423 in words is "sixty-six million, eight hundred four thousand, four hundred twenty-three".