6545478281 has 2 divisors, whose sum is σ = 6545478282. Its totient is φ = 6545478280.

The previous prime is 6545478271. The next prime is 6545478337. The reversal of 6545478281 is 1828745456.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 5640010000 + 905468281 = 75100^2 + 30091^2 .

It is a cyclic number.

It is a de Polignac number, because none of the positive numbers 2^k-6545478281 is a prime.

It is a super-2 number, since 2×6545478281² = 85686571854085429922, which contains 22 as substring.

It is a Sophie Germain prime.

It is a Curzon number.

It is not a weakly prime, because it can be changed into another prime (6545478221) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3272739140 + 3272739141.

It is an arithmetic number, because the mean of its divisors is an integer number (3272739141).

Almost surely, 2^6545478281 is an apocalyptic number.

It is an amenable number.

6545478281 is a deficient number, since it is larger than the sum of its proper divisors (1).

6545478281 is an equidigital number, since it uses as much as digits as its factorization.

6545478281 is an odious number, because the sum of its binary digits is odd.

The product of its digits is 2150400, while the sum is 50.

The square root of 6545478281 is about 80904.1301850530. The cubic root of 6545478281 is about 1870.5979843797.

The spelling of 6545478281 in words is "six billion, five hundred forty-five million, four hundred seventy-eight thousand, two hundred eighty-one".