663062661 has 6 divisors (see below), whose sum is σ = 957757190. Its totient is φ = 442041768.

The previous prime is 663062597. The next prime is 663062683. The reversal of 663062661 is 166260366.

It can be written as a sum of positive squares in only one way, i.e., 635342436 + 27720225 = 25206^2 + 5265^2 .

It is not a de Polignac number, because 663062661 - 2⁶ = 663062597 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 (663062161) 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, 36836806 + ... + 36836823.

Almost surely, 2^663062661 is an apocalyptic number.

It is an amenable number.

663062661 is a deficient number, since it is larger than the sum of its proper divisors (294694529).

663062661 is a wasteful number, since it uses less digits than its factorization.

663062661 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 73673635 (or 73673632 counting only the distinct ones).

The product of its (nonzero) digits is 46656, while the sum is 36.

The square root of 663062661 is about 25750.0031262134. The cubic root of 663062661 is about 872.0034250104.

The spelling of 663062661 in words is "six hundred sixty-three million, sixty-two thousand, six hundred sixty-one".