664546387 has 4 divisors (see below), whose sum is σ = 668218096. Its totient is φ = 660874680.

The previous prime is 664546343. The next prime is 664546391. The reversal of 664546387 is 783645466.

664546387 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a semiprime because it is the product of two primes.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664546387 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 664546387.

It is not an unprimeable number, because it can be changed into a prime (664586387) 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, 1835583 + ... + 1835944.

It is an arithmetic number, because the mean of its divisors is an integer number (167054524).

Almost surely, 2^664546387 is an apocalyptic number.

664546387 is a deficient number, since it is larger than the sum of its proper divisors (3671709).

664546387 is a wasteful number, since it uses less digits than its factorization.

664546387 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 3671708.

The product of its digits is 2903040, while the sum is 49.

The square root of 664546387 is about 25778.7972372646. The cubic root of 664546387 is about 872.6533637356.

The spelling of 664546387 in words is "six hundred sixty-four million, five hundred forty-six thousand, three hundred eighty-seven".