6508235321981 has 2 divisors, whose sum is σ = 6508235321982. Its totient is φ = 6508235321980.

The previous prime is 6508235321971. The next prime is 6508235322037. The reversal of 6508235321981 is 1891235328056.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5104282858756 + 1403952463225 = 2259266^2 + 1184885^2 .

It is a cyclic number.

It is not a de Polignac number, because 6508235321981 - 2¹⁴ = 6508235305597 is a prime.

It is a super-2 number, since 2×6508235321981² (a number of 26 digits) contains 22 as substring.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6508235321911) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3254117660990 + 3254117660991.

It is an arithmetic number, because the mean of its divisors is an integer number (3254117660991).

Almost surely, 2^{6508235321981} is an apocalyptic number.

It is an amenable number.

6508235321981 is a deficient number, since it is larger than the sum of its proper divisors (1).

6508235321981 is an equidigital number, since it uses as much as digits as its factorization.

6508235321981 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 3110400, while the sum is 53.

The spelling of 6508235321981 in words is "six trillion, five hundred eight billion, two hundred thirty-five million, three hundred twenty-one thousand, nine hundred eighty-one".