664759097 has 4 divisors (see below), whose sum is σ = 673865460. Its totient is φ = 655652736.

The previous prime is 664759091. The next prime is 664759111. The reversal of 664759097 is 790957466.

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

It can be written as a sum of positive squares in 2 ways, for example, as 357247801 + 307511296 = 18901^2 + 17536^2 .

It is a cyclic number.

It is not a de Polignac number, because 664759097 - 2¹⁸ = 664496953 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (664759091) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 4553072 + ... + 4553217.

It is an arithmetic number, because the mean of its divisors is an integer number (168466365).

Almost surely, 2^664759097 is an apocalyptic number.

It is an amenable number.

664759097 is a deficient number, since it is larger than the sum of its proper divisors (9106363).

664759097 is an equidigital number, since it uses as much as digits as its factorization.

664759097 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 9106362.

The product of its (nonzero) digits is 2857680, while the sum is 53.

The square root of 664759097 is about 25782.9225845326. The cubic root of 664759097 is about 872.7464609717.

The spelling of 664759097 in words is "six hundred sixty-four million, seven hundred fifty-nine thousand, ninety-seven".