6548221457 has 2 divisors, whose sum is σ = 6548221458. Its totient is φ = 6548221456.

The previous prime is 6548221429. The next prime is 6548221507. The reversal of 6548221457 is 7541228456.

6548221457 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

It is a weak prime.

It can be written as a sum of positive squares in only one way, i.e., 4212529216 + 2335692241 = 64904^2 + 48329^2 .

It is a cyclic number.

It is not a de Polignac number, because 6548221457 - 2⁸ = 6548221201 is a prime.

It is not a weakly prime, because it can be changed into another prime (6548221957) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3274110728 + 3274110729.

It is an arithmetic number, because the mean of its divisors is an integer number (3274110729).

Almost surely, 2^6548221457 is an apocalyptic number.

It is an amenable number.

6548221457 is a deficient number, since it is larger than the sum of its proper divisors (1).

6548221457 is an equidigital number, since it uses as much as digits as its factorization.

6548221457 is an evil number, because the sum of its binary digits is even.

The product of its digits is 537600, while the sum is 44.

The square root of 6548221457 is about 80921.0816598493. The cubic root of 6548221457 is about 1870.8592671869.

The spelling of 6548221457 in words is "six billion, five hundred forty-eight million, two hundred twenty-one thousand, four hundred fifty-seven".