63669730681 has 2 divisors, whose sum is σ = 63669730682. Its totient is φ = 63669730680.

The previous prime is 63669730679. The next prime is 63669730693. The reversal of 63669730681 is 18603796636.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 63594752400 + 74978281 = 252180^2 + 8659^2 .

It is a cyclic number.

It is not a de Polignac number, because 63669730681 - 2¹ = 63669730679 is a prime.

It is a super-2 number, since 2×63669730681² (a number of 22 digits) contains 22 as substring.

Together with 63669730679, it forms a pair of twin primes.

It is not a weakly prime, because it can be changed into another prime (63669730181) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31834865340 + 31834865341.

It is an arithmetic number, because the mean of its divisors is an integer number (31834865341).

Almost surely, 2^63669730681 is an apocalyptic number.

It is an amenable number.

63669730681 is a deficient number, since it is larger than the sum of its proper divisors (1).

63669730681 is an equidigital number, since it uses as much as digits as its factorization.

63669730681 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 5878656, while the sum is 55.

The spelling of 63669730681 in words is "sixty-three billion, six hundred sixty-nine million, seven hundred thirty thousand, six hundred eighty-one".