63006661 has 2 divisors, whose sum is σ = 63006662. Its totient is φ = 63006660.

The previous prime is 63006659. The next prime is 63006673. The reversal of 63006661 is 16660036.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62964225 + 42436 = 7935^2 + 206^2 .

It is a cyclic number.

It is not a de Polignac number, because 63006661 - 2¹ = 63006659 is a prime.

Together with 63006659, it forms a pair of twin primes.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63006611) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31503330 + 31503331.

It is an arithmetic number, because the mean of its divisors is an integer number (31503331).

Almost surely, 2^63006661 is an apocalyptic number.

It is an amenable number.

63006661 is a deficient number, since it is larger than the sum of its proper divisors (1).

63006661 is an equidigital number, since it uses as much as digits as its factorization.

63006661 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 3888, while the sum is 28.

The square root of 63006661 is about 7937.6735256623. The cubic root of 63006661 is about 397.9197438404.

Adding to 63006661 its reverse (16660036), we get a palindrome (79666697).

The spelling of 63006661 in words is "sixty-three million, six thousand, six hundred sixty-one".