63666697 has 2 divisors, whose sum is σ = 63666698. Its totient is φ = 63666696.

The previous prime is 63666679. The next prime is 63666719. The reversal of 63666697 is 79666636.

It is a happy number.

Together with previous prime (63666679) it forms an Ormiston pair, because they use the same digits, order apart.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60466176 + 3200521 = 7776^2 + 1789^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63666697 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 63666697.

It is not a weakly prime, because it can be changed into another prime (63666637) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31833348 + 31833349.

It is an arithmetic number, because the mean of its divisors is an integer number (31833349).

Almost surely, 2^63666697 is an apocalyptic number.

It is an amenable number.

63666697 is a deficient number, since it is larger than the sum of its proper divisors (1).

63666697 is an equidigital number, since it uses as much as digits as its factorization.

63666697 is an evil number, because the sum of its binary digits is even.

The product of its digits is 1469664, while the sum is 49.

The square root of 63666697 is about 7979.1413698468. The cubic root of 63666697 is about 399.3044098370.

The spelling of 63666697 in words is "sixty-three million, six hundred sixty-six thousand, six hundred ninety-seven".