63531514681 has 2 divisors, whose sum is σ = 63531514682. Its totient is φ = 63531514680.

The previous prime is 63531514667. The next prime is 63531514729. The reversal of 63531514681 is 18641513536.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 62710176400 + 821338281 = 250420^2 + 28659^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63531514681 is a prime.

It is a super-2 number, since 2×63531514681² (a number of 22 digits) contains 22 as substring.

It is not a weakly prime, because it can be changed into another prime (63531514661) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31765757340 + 31765757341.

It is an arithmetic number, because the mean of its divisors is an integer number (31765757341).

Almost surely, 2^63531514681 is an apocalyptic number.

It is an amenable number.

63531514681 is a deficient number, since it is larger than the sum of its proper divisors (1).

63531514681 is an equidigital number, since it uses as much as digits as its factorization.

63531514681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 259200, while the sum is 43.

The spelling of 63531514681 in words is "sixty-three billion, five hundred thirty-one million, five hundred fourteen thousand, six hundred eighty-one".