63997651 has 2 divisors, whose sum is σ = 63997652. Its totient is φ = 63997650.

The previous prime is 63997649. The next prime is 63997667. The reversal of 63997651 is 15679936.

63997651 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It is a cyclic number.

It is not a de Polignac number, because 63997651 - 2¹ = 63997649 is a prime.

Together with 63997649, it forms a pair of twin primes.

It is a Chen prime.

It is not a weakly prime, because it can be changed into another prime (63997621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31998825 + 31998826.

It is an arithmetic number, because the mean of its divisors is an integer number (31998826).

Almost surely, 2^63997651 is an apocalyptic number.

63997651 is a deficient number, since it is larger than the sum of its proper divisors (1).

63997651 is an equidigital number, since it uses as much as digits as its factorization.

63997651 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 306180, while the sum is 46.

The square root of 63997651 is about 7999.8531861529. The cubic root of 63997651 is about 399.9951061901.

The spelling of 63997651 in words is "sixty-three million, nine hundred ninety-seven thousand, six hundred fifty-one".