66404573 has 4 divisors (see below), whose sum is σ = 68546688. Its totient is φ = 64262460.

The previous prime is 66404557. The next prime is 66404581. The reversal of 66404573 is 37540466.

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 66404573 - 2⁴ = 66404557 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 (66404593) 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, 1071011 + ... + 1071072.

It is an arithmetic number, because the mean of its divisors is an integer number (17136672).

Almost surely, 2^66404573 is an apocalyptic number.

It is an amenable number.

66404573 is a deficient number, since it is larger than the sum of its proper divisors (2142115).

66404573 is a wasteful number, since it uses less digits than its factorization.

66404573 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2142114.

The product of its (nonzero) digits is 60480, while the sum is 35.

The square root of 66404573 is about 8148.9001098308. The cubic root of 66404573 is about 404.9480662971.

The spelling of 66404573 in words is "sixty-six million, four hundred four thousand, five hundred seventy-three".