664203587 has 2 divisors, whose sum is σ = 664203588. Its totient is φ = 664203586.

The previous prime is 664203581. The next prime is 664203601. The reversal of 664203587 is 785302466.

It is a happy number.

It is a weak prime.

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-664203587 is a prime.

It is not a weakly prime, because it can be changed into another prime (664203581) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332101793 + 332101794.

It is an arithmetic number, because the mean of its divisors is an integer number (332101794).

Almost surely, 2^664203587 is an apocalyptic number.

664203587 is a deficient number, since it is larger than the sum of its proper divisors (1).

664203587 is an equidigital number, since it uses as much as digits as its factorization.

664203587 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 241920, while the sum is 41.

The square root of 664203587 is about 25772.1475046221. The cubic root of 664203587 is about 872.5032879190.

It can be divided in two parts, 66420 and 3587, that added together give a palindrome (70007).

The spelling of 664203587 in words is "six hundred sixty-four million, two hundred three thousand, five hundred eighty-seven".