664065773 has 8 divisors (see below), whose sum is σ = 775080192. Its totient is φ = 557088336.

The previous prime is 664065767. The next prime is 664065799. The reversal of 664065773 is 377560466.

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

It is not a de Polignac number, because 664065773 - 2¹⁰ = 664064749 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664065173) 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, 1008890 + ... + 1009547.

It is an arithmetic number, because the mean of its divisors is an integer number (96885024).

Almost surely, 2^664065773 is an apocalyptic number.

It is an amenable number.

664065773 is a deficient number, since it is larger than the sum of its proper divisors (111014419).

664065773 is a wasteful number, since it uses less digits than its factorization.

664065773 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 2018491.

The product of its (nonzero) digits is 635040, while the sum is 44.

The square root of 664065773 is about 25769.4736655602. The cubic root of 664065773 is about 872.4429392108.

The spelling of 664065773 in words is "six hundred sixty-four million, sixty-five thousand, seven hundred seventy-three".