63660661 has 2 divisors, whose sum is σ = 63660662. Its totient is φ = 63660660.

The previous prime is 63660647. The next prime is 63660677. The reversal of 63660661 is 16606636.

It is a happy number.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 57380625 + 6280036 = 7575^2 + 2506^2 .

It is a cyclic number.

It is not a de Polignac number, because 63660661 - 2¹¹ = 63658613 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63660601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31830330 + 31830331.

It is an arithmetic number, because the mean of its divisors is an integer number (31830331).

Almost surely, 2^63660661 is an apocalyptic number.

It is an amenable number.

63660661 is a deficient number, since it is larger than the sum of its proper divisors (1).

63660661 is an equidigital number, since it uses as much as digits as its factorization.

63660661 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 23328, while the sum is 34.

The square root of 63660661 is about 7978.7631246955. The cubic root of 63660661 is about 399.2917905886.

The spelling of 63660661 in words is "sixty-three million, six hundred sixty thousand, six hundred sixty-one".