63729297809 has 2 divisors, whose sum is σ = 63729297810. Its totient is φ = 63729297808.

The previous prime is 63729297743. The next prime is 63729297839. The reversal of 63729297809 is 90879292736.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 56657328784 + 7071969025 = 238028^2 + 84095^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63729297809 is a prime.

It is a super-2 number, since 2×63729297809² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (63729297839) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31864648904 + 31864648905.

It is an arithmetic number, because the mean of its divisors is an integer number (31864648905).

Almost surely, 2^63729297809 is an apocalyptic number.

It is an amenable number.

63729297809 is a deficient number, since it is larger than the sum of its proper divisors (1).

63729297809 is an equidigital number, since it uses as much as digits as its factorization.

63729297809 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 20575296, while the sum is 62.

The spelling of 63729297809 in words is "sixty-three billion, seven hundred twenty-nine million, two hundred ninety-seven thousand, eight hundred nine".