664546403 has 2 divisors, whose sum is σ = 664546404. Its totient is φ = 664546402.

The previous prime is 664546391. The next prime is 664546417. The reversal of 664546403 is 304645466.

It is a happy number.

664546403 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664546403 - 2¹⁶ = 664480867 is a prime.

It is not a weakly prime, because it can be changed into another prime (664546453) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332273201 + 332273202.

It is an arithmetic number, because the mean of its divisors is an integer number (332273202).

Almost surely, 2^664546403 is an apocalyptic number.

664546403 is a deficient number, since it is larger than the sum of its proper divisors (1).

664546403 is an equidigital number, since it uses as much as digits as its factorization.

664546403 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 207360, while the sum is 38.

The square root of 664546403 is about 25778.7975475971. The cubic root of 664546403 is about 872.6533707391.

The spelling of 664546403 in words is "six hundred sixty-four million, five hundred forty-six thousand, four hundred three".