664099597 has 6 divisors (see below), whose sum is σ = 772524078. Its totient is φ = 569228184.

The previous prime is 664099573. The next prime is 664099621. The reversal of 664099597 is 795990466.

It is an interprime number because it is at equal distance from previous prime (664099573) and next prime (664099621).

It can be written as a sum of positive squares in only one way, i.e., 440118441 + 223981156 = 20979^2 + 14966^2 .

It is not a de Polignac number, because 664099597 - 2¹⁵ = 664066829 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (664099567) by changing a digit.

It is a polite number, since it can be written in 5 ways as a sum of consecutive naturals, for example, 6776478 + ... + 6776575.

It is an arithmetic number, because the mean of its divisors is an integer number (128754013).

Almost surely, 2^664099597 is an apocalyptic number.

It is an amenable number.

664099597 is a deficient number, since it is larger than the sum of its proper divisors (108424481).

664099597 is a wasteful number, since it uses less digits than its factorization.

664099597 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 13553067 (or 13553060 counting only the distinct ones).

The product of its (nonzero) digits is 3674160, while the sum is 55.

The square root of 664099597 is about 25770.1299375847. The cubic root of 664099597 is about 872.4577515031.

The spelling of 664099597 in words is "six hundred sixty-four million, ninety-nine thousand, five hundred ninety-seven".