6544655401 has 2 divisors, whose sum is σ = 6544655402. Its totient is φ = 6544655400.

The previous prime is 6544655363. The next prime is 6544655407. The reversal of 6544655401 is 1045564456.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 4241135376 + 2303520025 = 65124^2 + 47995^2 .

It is a cyclic number.

It is not a de Polignac number, because 6544655401 - 2¹⁵ = 6544622633 is a prime.

It is not a weakly prime, because it can be changed into another prime (6544655407) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3272327700 + 3272327701.

It is an arithmetic number, because the mean of its divisors is an integer number (3272327701).

Almost surely, 2^6544655401 is an apocalyptic number.

It is an amenable number.

6544655401 is a deficient number, since it is larger than the sum of its proper divisors (1).

6544655401 is an equidigital number, since it uses as much as digits as its factorization.

6544655401 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 288000, while the sum is 40.

The square root of 6544655401 is about 80899.0444999198. The cubic root of 6544655401 is about 1870.5195922383.

The spelling of 6544655401 in words is "six billion, five hundred forty-four million, six hundred fifty-five thousand, four hundred one".