6694838405 has 4 divisors (see below), whose sum is σ = 8033806092. Its totient is φ = 5355870720.

The previous prime is 6694838377. The next prime is 6694838467. The reversal of 6694838405 is 5048384966.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 5048384966 = 2 ⋅2524192483.

It can be written as a sum of positive squares in 2 ways, for example, as 3631990756 + 3062847649 = 60266^2 + 55343^2 .

It is not a de Polignac number, because 6694838405 - 2⁸ = 6694838149 is a prime.

It is a super-2 number, since 2×6694838405² = 89641722538125888050, which contains 22 as substring.

It is a Duffinian number.

It is a congruent number.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 669483836 + ... + 669483845.

It is an arithmetic number, because the mean of its divisors is an integer number (2008451523).

Almost surely, 2^6694838405 is an apocalyptic number.

It is an amenable number.

6694838405 is a deficient number, since it is larger than the sum of its proper divisors (1338967687).

6694838405 is a wasteful number, since it uses less digits than its factorization.

6694838405 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 1338967686.

The product of its (nonzero) digits is 4976640, while the sum is 53.

The square root of 6694838405 is about 81821.9921842533. The cubic root of 6694838405 is about 1884.7193943296.

The spelling of 6694838405 in words is "six billion, six hundred ninety-four million, eight hundred thirty-eight thousand, four hundred five".