63949121689 has 2 divisors, whose sum is σ = 63949121690. Its totient is φ = 63949121688.

The previous prime is 63949121671. The next prime is 63949121737. The reversal of 63949121689 is 98612194936.

63949121689 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 can be written as a sum of positive squares in only one way, i.e., 60870758400 + 3078363289 = 246720^2 + 55483^2 .

It is a cyclic number.

It is not a de Polignac number, because 63949121689 - 2⁹ = 63949121177 is a prime.

It is not a weakly prime, because it can be changed into another prime (63949121609) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31974560844 + 31974560845.

It is an arithmetic number, because the mean of its divisors is an integer number (31974560845).

Almost surely, 2^63949121689 is an apocalyptic number.

It is an amenable number.

63949121689 is a deficient number, since it is larger than the sum of its proper divisors (1).

63949121689 is an equidigital number, since it uses as much as digits as its factorization.

63949121689 is an evil number, because the sum of its binary digits is even.

The product of its digits is 5038848, while the sum is 58.

The spelling of 63949121689 in words is "sixty-three billion, nine hundred forty-nine million, one hundred twenty-one thousand, six hundred eighty-nine".