6543769691 has 4 divisors (see below), whose sum is σ = 6545080584. Its totient is φ = 6542458800.

The previous prime is 6543769681. The next prime is 6543769711. The reversal of 6543769691 is 1969673456.

6543769691 is digitally balanced in base 3, because in such base it contains all the possibile digits an equal number of times.

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

It is a cyclic number.

It is not a de Polignac number, because 6543769691 - 2¹⁰ = 6543768667 is a prime.

It is a Duffinian number.

It is not an unprimeable number, because it can be changed into a prime (6543769621) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 647930 + ... + 657951.

It is an arithmetic number, because the mean of its divisors is an integer number (1636270146).

Almost surely, 2^6543769691 is an apocalyptic number.

6543769691 is a deficient number, since it is larger than the sum of its proper divisors (1310893).

6543769691 is a wasteful number, since it uses less digits than its factorization.

6543769691 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1310892.

The product of its digits is 7348320, while the sum is 56.

The square root of 6543769691 is about 80893.5701462113. The cubic root of 6543769691 is about 1870.4352072172.

The spelling of 6543769691 in words is "six billion, five hundred forty-three million, seven hundred sixty-nine thousand, six hundred ninety-one".