663326165 has 4 divisors (see below), whose sum is σ = 795991404. Its totient is φ = 530660928.

The previous prime is 663326161. The next prime is 663326177. The reversal of 663326165 is 561623366.

It is a happy number.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 561623366 = 2 ⋅280811683.

It can be written as a sum of positive squares in 2 ways, for example, as 295530481 + 367795684 = 17191^2 + 19178^2 .

It is a cyclic number.

It is not a de Polignac number, because 663326165 - 2² = 663326161 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (663326161) 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, 66332612 + ... + 66332621.

It is an arithmetic number, because the mean of its divisors is an integer number (198997851).

Almost surely, 2^663326165 is an apocalyptic number.

It is an amenable number.

663326165 is a deficient number, since it is larger than the sum of its proper divisors (132665239).

663326165 is a wasteful number, since it uses less digits than its factorization.

663326165 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 132665238.

The product of its digits is 116640, while the sum is 38.

The square root of 663326165 is about 25755.1191998795. The cubic root of 663326165 is about 872.1189223697.

The spelling of 663326165 in words is "six hundred sixty-three million, three hundred twenty-six thousand, one hundred sixty-five".