664248765 has 8 divisors (see below), whose sum is σ = 1062798048. Its totient is φ = 354266000.

The previous prime is 664248719. The next prime is 664248817. The reversal of 664248765 is 567842466.

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

It is not a de Polignac number, because 664248765 - 2¹⁰ = 664247741 is a prime.

It is a Curzon number.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 22141611 + ... + 22141640.

It is an arithmetic number, because the mean of its divisors is an integer number (132849756).

Almost surely, 2^664248765 is an apocalyptic number.

It is an amenable number.

664248765 is a deficient number, since it is larger than the sum of its proper divisors (398549283).

664248765 is a wasteful number, since it uses less digits than its factorization.

664248765 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 44283259.

The product of its digits is 1935360, while the sum is 48.

The square root of 664248765 is about 25773.0239785711. The cubic root of 664248765 is about 872.5230695345.

The spelling of 664248765 in words is "six hundred sixty-four million, two hundred forty-eight thousand, seven hundred sixty-five".