6436642805 has 16 divisors (see below), whose sum is σ = 8113910400. Its totient is φ = 4892361408.

The previous prime is 6436642783. The next prime is 6436642831. The reversal of 6436642805 is 5082466346.

It is a cyclic number.

It is not a de Polignac number, because 6436642805 - 2²⁰ = 6435594229 is a prime.

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 15 ways as a sum of consecutive naturals, for example, 170687 + ... + 204956.

It is an arithmetic number, because the mean of its divisors is an integer number (507119400).

Almost surely, 2^6436642805 is an apocalyptic number.

It is an amenable number.

6436642805 is a deficient number, since it is larger than the sum of its proper divisors (1677267595).

6436642805 is a wasteful number, since it uses less digits than its factorization.

6436642805 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 375820.

The product of its (nonzero) digits is 829440, while the sum is 44.

The square root of 6436642805 is about 80228.6906598880. The cubic root of 6436642805 is about 1860.1721431804.

The spelling of 6436642805 in words is "six billion, four hundred thirty-six million, six hundred forty-two thousand, eight hundred five".