6498863681 has 2 divisors, whose sum is σ = 6498863682. Its totient is φ = 6498863680.

The previous prime is 6498863597. The next prime is 6498863687. The reversal of 6498863681 is 1863688946.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4448223025 + 2050640656 = 66695^2 + 45284^2 .

It is a cyclic number.

It is not a de Polignac number, because 6498863681 - 2¹⁴ = 6498847297 is a prime.

It is a super-2 number, since 2×6498863681² = 84470458288441739522, which contains 22 as substring.

It is a self number, because there is not a number n which added to its sum of digits gives 6498863681.

It is not a weakly prime, because it can be changed into another prime (6498863687) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3249431840 + 3249431841.

It is an arithmetic number, because the mean of its divisors is an integer number (3249431841).

Almost surely, 2^6498863681 is an apocalyptic number.

It is an amenable number.

6498863681 is a deficient number, since it is larger than the sum of its proper divisors (1).

6498863681 is an equidigital number, since it uses as much as digits as its factorization.

6498863681 is an evil number, because the sum of its binary digits is even.

The product of its digits is 11943936, while the sum is 59.

The square root of 6498863681 is about 80615.5300236871. The cubic root of 6498863681 is about 1866.1468201901.

The spelling of 6498863681 in words is "six billion, four hundred ninety-eight million, eight hundred sixty-three thousand, six hundred eighty-one".