63644421306457 has 2 divisors, whose sum is σ = 63644421306458. Its totient is φ = 63644421306456.

The previous prime is 63644421306451. The next prime is 63644421306467. The reversal of 63644421306457 is 75460312444636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 36289732617216 + 27354688689241 = 6024096^2 + 5230171^2 .

It is a cyclic number.

It is not a de Polignac number, because 63644421306457 - 2³⁵ = 63610061568089 is a prime.

It is a super-2 number, since 2×63644421306457² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 63644421306398 and 63644421306407.

It is not a weakly prime, because it can be changed into another prime (63644421306451) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31822210653228 + 31822210653229.

It is an arithmetic number, because the mean of its divisors is an integer number (31822210653229).

Almost surely, 2^{63644421306457} is an apocalyptic number.

It is an amenable number.

63644421306457 is a deficient number, since it is larger than the sum of its proper divisors (1).

63644421306457 is an equidigital number, since it uses as much as digits as its factorization.

63644421306457 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 34836480, while the sum is 55.

The spelling of 63644421306457 in words is "sixty-three trillion, six hundred forty-four billion, four hundred twenty-one million, three hundred six thousand, four hundred fifty-seven".