63994657 has 2 divisors, whose sum is σ = 63994658. Its totient is φ = 63994656.

The previous prime is 63994639. The next prime is 63994669. The reversal of 63994657 is 75649936.

63994657 is digitally balanced in base 2, because in such base it contains all the possibile digits an equal number of times.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 39551521 + 24443136 = 6289^2 + 4944^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63994657 is a prime.

It is a super-2 number, since 2×63994657² = 8190632249095298, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 63994657.

It is not a weakly prime, because it can be changed into another prime (63994607) 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, 31997328 + 31997329.

It is an arithmetic number, because the mean of its divisors is an integer number (31997329).

Almost surely, 2^63994657 is an apocalyptic number.

It is an amenable number.

63994657 is a deficient number, since it is larger than the sum of its proper divisors (1).

63994657 is an equidigital number, since it uses as much as digits as its factorization.

63994657 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 1224720, while the sum is 49.

The square root of 63994657 is about 7999.6660555301. Note that the first 3 decimals coincide. The cubic root of 63994657 is about 399.9888684402.

The spelling of 63994657 in words is "sixty-three million, nine hundred ninety-four thousand, six hundred fifty-seven".