664016573 has 4 divisors (see below), whose sum is σ = 724381728. Its totient is φ = 603651420.

The previous prime is 664016531. The next prime is 664016597. The reversal of 664016573 is 375610466.

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 664016573 - 2⁸ = 664016317 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 (664018573) 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, 30182561 + ... + 30182582.

It is an arithmetic number, because the mean of its divisors is an integer number (181095432).

Almost surely, 2^664016573 is an apocalyptic number.

It is an amenable number.

664016573 is a deficient number, since it is larger than the sum of its proper divisors (60365155).

664016573 is a wasteful number, since it uses less digits than its factorization.

664016573 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 60365154.

The product of its (nonzero) digits is 90720, while the sum is 38.

The square root of 664016573 is about 25768.5190300102. The cubic root of 664016573 is about 872.4213925235.

The spelling of 664016573 in words is "six hundred sixty-four million, sixteen thousand, five hundred seventy-three".