664373693 has 4 divisors (see below), whose sum is σ = 679824288. Its totient is φ = 648923100.

The previous prime is 664373683. The next prime is 664373707. The reversal of 664373693 is 396373466.

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 664373693 - 2¹² = 664369597 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 (664373663) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 7725233 + ... + 7725318.

It is an arithmetic number, because the mean of its divisors is an integer number (169956072).

Almost surely, 2^664373693 is an apocalyptic number.

It is an amenable number.

664373693 is a deficient number, since it is larger than the sum of its proper divisors (15450595).

664373693 is a wasteful number, since it uses less digits than its factorization.

664373693 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 15450594.

The product of its digits is 1469664, while the sum is 47.

The square root of 664373693 is about 25775.4474839914. The cubic root of 664373693 is about 872.5777657743.

The spelling of 664373693 in words is "six hundred sixty-four million, three hundred seventy-three thousand, six hundred ninety-three".