63319661 has 2 divisors, whose sum is σ = 63319662. Its totient is φ = 63319660.

The previous prime is 63319637. The next prime is 63319687. The reversal of 63319661 is 16691336.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63282025 + 37636 = 7955^2 + 194^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63319661 is a prime.

It is a Sophie Germain prime.

It is a Curzon number.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63319601) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31659830 + 31659831.

It is an arithmetic number, because the mean of its divisors is an integer number (31659831).

Almost surely, 2^63319661 is an apocalyptic number.

It is an amenable number.

63319661 is a deficient number, since it is larger than the sum of its proper divisors (1).

63319661 is an equidigital number, since it uses as much as digits as its factorization.

63319661 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 17496, while the sum is 35.

The square root of 63319661 is about 7957.3652046390. The cubic root of 63319661 is about 398.5775748458.

The spelling of 63319661 in words is "sixty-three million, three hundred nineteen thousand, six hundred sixty-one".