664095293 has 4 divisors (see below), whose sum is σ = 703159740. Its totient is φ = 625030848.

The previous prime is 664095287. The next prime is 664095323. The reversal of 664095293 is 392590466.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 392590466 = 2 ⋅196295233.

It can be written as a sum of positive squares in 2 ways, for example, as 480574084 + 183521209 = 21922^2 + 13547^2 .

It is a cyclic number.

It is not a de Polignac number, because 664095293 - 2¹⁰ = 664094269 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 (664095493) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 19532198 + ... + 19532231.

It is an arithmetic number, because the mean of its divisors is an integer number (175789935).

Almost surely, 2^664095293 is an apocalyptic number.

It is an amenable number.

664095293 is a deficient number, since it is larger than the sum of its proper divisors (39064447).

664095293 is a wasteful number, since it uses less digits than its factorization.

664095293 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 39064446.

The product of its (nonzero) digits is 349920, while the sum is 44.

The square root of 664095293 is about 25770.0464299155. The cubic root of 664095293 is about 872.4558667124.

The spelling of 664095293 in words is "six hundred sixty-four million, ninety-five thousand, two hundred ninety-three".