6541883661 has 4 divisors (see below), whose sum is σ = 8722511552. Its totient is φ = 4361255772.

The previous prime is 6541883659. The next prime is 6541883671. The reversal of 6541883661 is 1663881456.

It is a semiprime because it is the product of two primes, and also a Blum integer, because the two primes are equal to 3 mod 4.

It is not a de Polignac number, because 6541883661 - 2¹ = 6541883659 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 6541883661.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (6541883671) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (17) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 1090313941 + ... + 1090313946.

It is an arithmetic number, because the mean of its divisors is an integer number (2180627888).

Almost surely, 2^6541883661 is an apocalyptic number.

It is an amenable number.

6541883661 is a deficient number, since it is larger than the sum of its proper divisors (2180627891).

6541883661 is a wasteful number, since it uses less digits than its factorization.

6541883661 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2180627890.

The product of its digits is 829440, while the sum is 48.

The square root of 6541883661 is about 80881.9118282945. The cubic root of 6541883661 is about 1870.2554924631.

The spelling of 6541883661 in words is "six billion, five hundred forty-one million, eight hundred eighty-three thousand, six hundred sixty-one".