646806803049 has 27 divisors (see below), whose sum is σ = 1026974152477. Its totient is φ = 391988038200.

The previous prime is 646806803047. The next prime is 646806803059. The reversal of 646806803049 is 940308608646.

The square root of 646806803049 is 804243.

It is a perfect power (a square), and thus also a powerful number.

It is not a de Polignac number, because 646806803049 - 2¹ = 646806803047 is a prime.

It is a Duffinian number.

It is a Curzon number.

It is a junction number, because it is equal to n+sod(n) for n = 646806802986 and 646806803004.

It is not an unprimeable number, because it can be changed into a prime (646806803047) 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 26 ways as a sum of consecutive naturals, for example, 26527834 + ... + 26552204.

Almost surely, 2^646806803049 is an apocalyptic number.

646806803049 is the 804243-rd square number.

646806803049 is the 402122-nd centered octagonal number.

It is an amenable number.

646806803049 is a deficient number, since it is larger than the sum of its proper divisors (380167349428).

646806803049 is an frugal number, since it uses more digits than its factorization.

646806803049 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 48770 (or 24385 counting only the distinct ones).

The product of its (nonzero) digits is 5971968, while the sum is 54.

The spelling of 646806803049 in words is "six hundred forty-six billion, eight hundred six million, eight hundred three thousand, forty-nine".