664198559 has 2 divisors, whose sum is σ = 664198560. Its totient is φ = 664198558.

The previous prime is 664198547. The next prime is 664198567. The reversal of 664198559 is 955891466.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 664198559 - 2⁴ = 664198543 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 664198559.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (664198859) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 332099279 + 332099280.

It is an arithmetic number, because the mean of its divisors is an integer number (332099280).

Almost surely, 2^664198559 is an apocalyptic number.

664198559 is a deficient number, since it is larger than the sum of its proper divisors (1).

664198559 is an equidigital number, since it uses as much as digits as its factorization.

664198559 is an evil number, because the sum of its binary digits is even.

The product of its digits is 2332800, while the sum is 53.

The square root of 664198559 is about 25772.0499572696. The cubic root of 664198559 is about 872.5010863061.

The spelling of 664198559 in words is "six hundred sixty-four million, one hundred ninety-eight thousand, five hundred fifty-nine".