6541570813 has 2 divisors, whose sum is σ = 6541570814. Its totient is φ = 6541570812.

The previous prime is 6541570801. The next prime is 6541570817. The reversal of 6541570813 is 3180751456.

It is a happy number.

It is a strong prime.

It can be written as a sum of positive squares in only one way, i.e., 5030071929 + 1511498884 = 70923^2 + 38878^2 .

It is a cyclic number.

It is not a de Polignac number, because 6541570813 - 2²⁹ = 6004699901 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (6541570817) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 3270785406 + 3270785407.

It is an arithmetic number, because the mean of its divisors is an integer number (3270785407).

Almost surely, 2^6541570813 is an apocalyptic number.

It is an amenable number.

6541570813 is a deficient number, since it is larger than the sum of its proper divisors (1).

6541570813 is an equidigital number, since it uses as much as digits as its factorization.

6541570813 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 100800, while the sum is 40.

The square root of 6541570813 is about 80879.9778251701. The cubic root of 6541570813 is about 1870.2256786741.

The spelling of 6541570813 in words is "six billion, five hundred forty-one million, five hundred seventy thousand, eight hundred thirteen".