63305398947881 has 2 divisors, whose sum is σ = 63305398947882. Its totient is φ = 63305398947880.

The previous prime is 63305398947871. The next prime is 63305398948007. The reversal of 63305398947881 is 18874989350336.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 60430271763481 + 2875127184400 = 7773691^2 + 1695620^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-63305398947881 is a prime.

It is a super-2 number, since 2×63305398947881² (a number of 28 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 63305398947799 and 63305398947808.

It is not a weakly prime, because it can be changed into another prime (63305398947871) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 31652699473940 + 31652699473941.

It is an arithmetic number, because the mean of its divisors is an integer number (31652699473941).

Almost surely, 2^{63305398947881} is an apocalyptic number.

It is an amenable number.

63305398947881 is a deficient number, since it is larger than the sum of its proper divisors (1).

63305398947881 is an equidigital number, since it uses as much as digits as its factorization.

63305398947881 is an evil number, because the sum of its binary digits is even.

The product of its (nonzero) digits is 940584960, while the sum is 74.

The spelling of 63305398947881 in words is "sixty-three trillion, three hundred five billion, three hundred ninety-eight million, nine hundred forty-seven thousand, eight hundred eighty-one".