664754785 has 8 divisors (see below), whose sum is σ = 797912640. Its totient is φ = 531665904.

The previous prime is 664754773. The next prime is 664754789. The reversal of 664754785 is 587457466.

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

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664754785 is a prime.

It is not an unprimeable number, because it can be changed into a prime (664754789) 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 7 ways as a sum of consecutive naturals, for example, 7086 + ... + 37144.

It is an arithmetic number, because the mean of its divisors is an integer number (99739080).

Almost surely, 2^664754785 is an apocalyptic number.

It is an amenable number.

664754785 is a deficient number, since it is larger than the sum of its proper divisors (133157855).

664754785 is a wasteful number, since it uses less digits than its factorization.

664754785 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 34487.

The product of its digits is 5644800, while the sum is 52.

The square root of 664754785 is about 25782.8389631553. The cubic root of 664754785 is about 872.7445739267.

The spelling of 664754785 in words is "six hundred sixty-four million, seven hundred fifty-four thousand, seven hundred eighty-five".