6543195541 has 4 divisors (see below), whose sum is σ = 6543448684. Its totient is φ = 6542942400.

The previous prime is 6543195481. The next prime is 6543195559. The reversal of 6543195541 is 1455913456.

It is a semiprime because it is the product of two primes.

It can be written as a sum of positive squares in 2 ways, for example, as 2254255441 + 4288940100 = 47479^2 + 65490^2 .

It is a cyclic number.

It is not a de Polignac number, because 6543195541 - 2¹³ = 6543187349 is a prime.

It is a Duffinian number.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6543195341) by changing a digit.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 82740 + ... + 141181.

It is an arithmetic number, because the mean of its divisors is an integer number (1635862171).

Almost surely, 2^6543195541 is an apocalyptic number.

It is an amenable number.

6543195541 is a deficient number, since it is larger than the sum of its proper divisors (253143).

6543195541 is a wasteful number, since it uses less digits than its factorization.

6543195541 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 253142.

The product of its digits is 324000, while the sum is 43.

The square root of 6543195541 is about 80890.0212696226. The cubic root of 6543195541 is about 1870.3805016558.

The spelling of 6543195541 in words is "six billion, five hundred forty-three million, one hundred ninety-five thousand, five hundred forty-one".