63644305721701 has 2 divisors, whose sum is σ = 63644305721702. Its totient is φ = 63644305721700.

The previous prime is 63644305721681. The next prime is 63644305721809. The reversal of 63644305721701 is 10712750344636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 56192639630625 + 7451666091076 = 7496175^2 + 2729774^2 .

It is a cyclic number.

It is not a de Polignac number, because 63644305721701 - 2⁵ = 63644305721669 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (63644305121701) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31822152860850 + 31822152860851.

It is an arithmetic number, because the mean of its divisors is an integer number (31822152860851).

Almost surely, 2^{63644305721701} is an apocalyptic number.

It is an amenable number.

63644305721701 is a deficient number, since it is larger than the sum of its proper divisors (1).

63644305721701 is an equidigital number, since it uses as much as digits as its factorization.

63644305721701 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 2540160, while the sum is 49.

The spelling of 63644305721701 in words is "sixty-three trillion, six hundred forty-four billion, three hundred five million, seven hundred twenty-one thousand, seven hundred one".