6936643689 has 4 divisors (see below), whose sum is σ = 9248858256. Its totient is φ = 4624429124.

The previous prime is 6936643631. The next prime is 6936643691. The reversal of 6936643689 is 9863466396.

It is a happy number.

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 a cyclic number.

It is not a de Polignac number, because 6936643689 - 2¹⁹ = 6936119401 is a prime.

It is not an unprimeable number, because it can be changed into a prime (6936643619) 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, 1156107279 + ... + 1156107284.

It is an arithmetic number, because the mean of its divisors is an integer number (2312214564).

Almost surely, 2^6936643689 is an apocalyptic number.

It is an amenable number.

6936643689 is a deficient number, since it is larger than the sum of its proper divisors (2312214567).

6936643689 is a wasteful number, since it uses less digits than its factorization.

6936643689 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2312214566.

The product of its digits is 30233088, while the sum is 60.

The square root of 6936643689 is about 83286.5156492934. The cubic root of 6936643689 is about 1907.1424324000.

The spelling of 6936643689 in words is "six billion, nine hundred thirty-six million, six hundred forty-three thousand, six hundred eighty-nine".