664349599 has 2 divisors, whose sum is σ = 664349600. Its totient is φ = 664349598.

The previous prime is 664349593. The next prime is 664349633. The reversal of 664349599 is 995943466.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 664349599 - 2³ = 664349591 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664349591) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332174799 + 332174800.

It is an arithmetic number, because the mean of its divisors is an integer number (332174800).

Almost surely, 2^664349599 is an apocalyptic number.

664349599 is a deficient number, since it is larger than the sum of its proper divisors (1).

664349599 is an equidigital number, since it uses as much as digits as its factorization.

664349599 is an evil number, because the sum of its binary digits is even.

The product of its digits is 6298560, while the sum is 55.

The square root of 664349599 is about 25774.9800969855. The cubic root of 664349599 is about 872.5672174222.

The spelling of 664349599 in words is "six hundred sixty-four million, three hundred forty-nine thousand, five hundred ninety-nine".