6498724789981 has 2 divisors, whose sum is σ = 6498724789982. Its totient is φ = 6498724789980.

The previous prime is 6498724789919. The next prime is 6498724790021. The reversal of 6498724789981 is 1899874278946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5036922887481 + 1461801902500 = 2244309^2 + 1209050^2 .

It is a cyclic number.

It is not a de Polignac number, because 6498724789981 - 2³³ = 6490134855389 is a prime.

It is a super-2 number, since 2×6498724789981² (a number of 26 digits) contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 6498724789895 and 6498724789904.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6498724769981) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3249362394990 + 3249362394991.

It is an arithmetic number, because the mean of its divisors is an integer number (3249362394991).

Almost surely, 2^{6498724789981} is an apocalyptic number.

It is an amenable number.

6498724789981 is a deficient number, since it is larger than the sum of its proper divisors (1).

6498724789981 is an equidigital number, since it uses as much as digits as its factorization.

6498724789981 is an evil number, because the sum of its binary digits is even.

The product of its digits is 3511517184, while the sum is 82.

The spelling of 6498724789981 in words is "six trillion, four hundred ninety-eight billion, seven hundred twenty-four million, seven hundred eighty-nine thousand, nine hundred eighty-one".