664715783 has 8 divisors (see below), whose sum is σ = 679311360. Its totient is φ = 650139160.

The previous prime is 664715773. The next prime is 664715791. The reversal of 664715783 is 387517466.

664715783 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 664715783 - 2¹⁰ = 664714759 is a prime.

It is a Harshad number since it is a multiple of its sum of digits (47).

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664715713) 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, 84158 + ... + 91716.

It is an arithmetic number, because the mean of its divisors is an integer number (84913920).

Almost surely, 2^664715783 is an apocalyptic number.

664715783 is a deficient number, since it is larger than the sum of its proper divisors (14595577).

664715783 is a wasteful number, since it uses less digits than its factorization.

664715783 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9477.

The product of its digits is 846720, while the sum is 47.

The square root of 664715783 is about 25782.0825962528. The cubic root of 664715783 is about 872.7275052520.

The spelling of 664715783 in words is "six hundred sixty-four million, seven hundred fifteen thousand, seven hundred eighty-three".